From f5678661612c3a728f43225f5e413877c2d4c790 Mon Sep 17 00:00:00 2001
From: Florian Sylvain <sylvainflorian@icloud.com>
Date: Thu, 8 Oct 2026 13:57:41 +0200
Subject: [PATCH] feat: image variants settings screens

---
 docs/design/components.md                     |    2 +-
 docs/design/routes.md                         |    2 +
 docs/design/screens/image-variants.md         |    3 +
 .../RenewCMS Screens Image variants.dc.html   |    1 +
 docs/design/source/VariantsFrame.dc.html      |   14 +-
 features/image_variants_screens.feature       |  690 +++++++++
 features/image_variants_screens.qa.md         |  156 +++
 web/src/components/DashboardShell.vue         |   50 +-
 .../__tests__/DashboardShell.spec.ts          |   42 +-
 web/src/components/variants/ImageCompare.vue  |  115 ++
 .../variants/RequestReferenceCard.vue         |  113 ++
 .../components/variants/VariantCardList.vue   |   69 +
 .../components/variants/VariantFormFields.vue |  394 ++++++
 .../variants/VariantFormSlideover.vue         |  306 ++++
 .../components/variants/VariantPreview.vue    |  111 ++
 .../components/variants/VariantRowMenu.vue    |   64 +
 .../variants/VariantStatusSwitch.vue          |   55 +
 web/src/components/variants/VariantsEmpty.vue |   61 +
 .../components/variants/VariantsForbidden.vue |   34 +
 .../components/variants/VariantsSkeleton.vue  |   41 +
 web/src/components/variants/VariantsTable.vue |  175 +++
 web/src/components/variants/VariantsTabs.vue  |   39 +
 web/src/composables/useImageVariants.ts       |   99 ++
 web/src/composables/useVariantForm.ts         |   93 ++
 web/src/composables/useVariantToasts.ts       |   31 +
 web/src/i18n/messages.ts                      |  124 ++
 .../__tests__/variantEstimate.spec.ts         |   93 ++
 .../variants/__tests__/variantForm.spec.ts    |  156 +++
 .../variants/__tests__/variantFormat.spec.ts  |  170 +++
 web/src/lib/variants/variantErrors.ts         |   47 +
 web/src/lib/variants/variantEstimate.ts       |   64 +
 web/src/lib/variants/variantForm.ts           |  154 ++
 web/src/lib/variants/variantFormat.ts         |   93 ++
 web/src/lib/variants/variantOutput.ts         |   54 +
 web/src/router/index.ts                       |    5 +
 web/src/stores/imageVariants.ts               |  144 ++
 web/src/views/VariantsPage.vue                |  420 ++++++
 web/src/views/__tests__/VariantsForm.spec.ts  | 1237 +++++++++++++++++
 web/src/views/__tests__/VariantsPage.spec.ts  |  933 +++++++++++++
 web/src/views/__tests__/variantsTestKit.ts    |  350 +++++
 web/visual/check.ts                           |   65 +
 web/visual/states.ts                          |  334 +++++
 42 files changed, 7192 insertions(+), 11 deletions(-)
 create mode 100644 features/image_variants_screens.feature
 create mode 100644 features/image_variants_screens.qa.md
 create mode 100644 web/src/components/variants/ImageCompare.vue
 create mode 100644 web/src/components/variants/RequestReferenceCard.vue
 create mode 100644 web/src/components/variants/VariantCardList.vue
 create mode 100644 web/src/components/variants/VariantFormFields.vue
 create mode 100644 web/src/components/variants/VariantFormSlideover.vue
 create mode 100644 web/src/components/variants/VariantPreview.vue
 create mode 100644 web/src/components/variants/VariantRowMenu.vue
 create mode 100644 web/src/components/variants/VariantStatusSwitch.vue
 create mode 100644 web/src/components/variants/VariantsEmpty.vue
 create mode 100644 web/src/components/variants/VariantsForbidden.vue
 create mode 100644 web/src/components/variants/VariantsSkeleton.vue
 create mode 100644 web/src/components/variants/VariantsTable.vue
 create mode 100644 web/src/components/variants/VariantsTabs.vue
 create mode 100644 web/src/composables/useImageVariants.ts
 create mode 100644 web/src/composables/useVariantForm.ts
 create mode 100644 web/src/composables/useVariantToasts.ts
 create mode 100644 web/src/lib/variants/__tests__/variantEstimate.spec.ts
 create mode 100644 web/src/lib/variants/__tests__/variantForm.spec.ts
 create mode 100644 web/src/lib/variants/__tests__/variantFormat.spec.ts
 create mode 100644 web/src/lib/variants/variantErrors.ts
 create mode 100644 web/src/lib/variants/variantEstimate.ts
 create mode 100644 web/src/lib/variants/variantForm.ts
 create mode 100644 web/src/lib/variants/variantFormat.ts
 create mode 100644 web/src/lib/variants/variantOutput.ts
 create mode 100644 web/src/stores/imageVariants.ts
 create mode 100644 web/src/views/VariantsPage.vue
 create mode 100644 web/src/views/__tests__/VariantsForm.spec.ts
 create mode 100644 web/src/views/__tests__/VariantsPage.spec.ts
 create mode 100644 web/src/views/__tests__/variantsTestKit.ts

diff --git a/docs/design/components.md b/docs/design/components.md
index b9e1463..73924e9 100644
--- a/docs/design/components.md
+++ b/docs/design/components.md
@@ -70,7 +70,7 @@ Responsive 400 px card from sm up, with its top 12 vh from the top. Below sm , t
 
 ### DashboardShell
 
-The sidebar has seven destinations for owner and admin (Home, Articles, Media, Users, Activity, Integration, Settings; regular users get Home, Articles, Media, Activity), and the user menu sits at its foot. The top bar carries the breadcrumbs and page title. Collapsing the sidebar leaves a 56 px icon rail. Below lg , the sidebar becomes a slideover.
+The sidebar has seven destinations for owner and admin (Home, Articles, Media, Users, Activity, Integration, Settings; regular users get Home, Articles, Media, Activity), and the user menu sits at its foot. For owner and admin, Settings expands to a Media group with Variants and Cache (see "Sidebar entry (1l)" in [image-variants](screens/image-variants.md)); it is built with the `children` of UNavigationMenu, and the same group appears in the mobile drawer. The top bar carries the breadcrumbs and page title. Collapsing the sidebar leaves a 56 px icon rail. Below lg , the sidebar becomes a slideover.
 
 RenewCMS
 
diff --git a/docs/design/routes.md b/docs/design/routes.md
index e24ee71..36a23ac 100644
--- a/docs/design/routes.md
+++ b/docs/design/routes.md
@@ -27,6 +27,8 @@ A global `router.beforeEach` guard reads `meta.auth`. On the first navigation it
 | `/invite/accept` | AuthShell | public | AcceptInvitePage | GET /v1/auth/invite?c=* · POST /v1/auth/invite/accept* |
 | `/:pathMatch(.*)*` | either | any | NotFoundPage | none |
 
+The sidebar reaches `/settings/media/variants` and `/settings/media/cache` through the Media group under Settings (owner and admin only). See [image-variants](screens/image-variants.md), frame 1l.
+
 `/media` and `/article/:id/edit` also gain image variants: GET /v1/media/{id}/variants · POST|DELETE /v1/media/{id}/variants/{name} and the `variants` and `sort=total_size` query parameters on GET /v1/media/ (proposed). See [image-variants](screens/image-variants.md).
 
 Auth values: `public` needs no session, `session` needs a logged-in account (verified or not), `verified` needs a verified account, `admin` needs an admin or owner account, `any` applies to redirects and the catch-all.
diff --git a/docs/design/screens/image-variants.md b/docs/design/screens/image-variants.md
index 3097595..58c1447 100644
--- a/docs/design/screens/image-variants.md
+++ b/docs/design/screens/image-variants.md
@@ -31,6 +31,9 @@ Admin-only page under Settings → Media, with two tabs: Variants and Cache. Des
 | 1i | Delete confirm | Delete in the row menu. |
 | 1j | Delete in progress | Delete was confirmed. The button shows a spinner. |
 | 1k | Request reference | Mobile scrolled to the reference card. On desktop it is visible below the table. |
+| 1l | Entry: sidebar | From any page, Settings expands in the sidebar to Media: Variants and Cache. Admin only. On mobile the menu button opens it as a drawer. |
+
+**Sidebar entry (1l).** For owner and admin, the Settings item has a chevron (right when closed, down when open) and expands to a group: a muted uppercase label "Media" (11 px, semibold, 0.04em tracking), then "Variants" (layers icon) and "Cache" (database icon). The group is indented 19 px with a 1 px left border; its items are 32 px high (44 px in the mobile drawer) with 14 px icons. The group is open on every `/settings` route. When a subpage is current, its item takes the sand fill and Settings keeps only the highlighted text and medium weight. On `/settings` itself Settings is the current item. Other roles see no chevron and no group. Cache stays inert until its screen exists.
 
 ### Copy: Variants list
 
diff --git a/docs/design/source/RenewCMS Screens Image variants.dc.html b/docs/design/source/RenewCMS Screens Image variants.dc.html
index b9cb136..dfa386f 100644
--- a/docs/design/source/RenewCMS Screens Image variants.dc.html	
+++ b/docs/design/source/RenewCMS Screens Image variants.dc.html	
@@ -113,6 +113,7 @@ class Component extends DCLogic {
 					st('1h', 'Purge confirm', 'Purge cache in the row menu.', l({}, { modal: 'purgeVariant' })),
 					st('1i', 'Delete confirm', 'Delete in the row menu.', l({}, { modal: 'deleteVariant' })),
 					st('1j', 'Delete in progress', 'Delete was confirmed. The button shows a spinner.', l({}, { modal: 'deleteVariant', loadingModal: true })),
+					st('1l', 'Entry: sidebar', 'From any page, Settings expands in the sidebar to Media: Variants and Cache. Admin only. On mobile the menu button opens it as a drawer.', { kind: 'media', ...MB, sideOpen: true, ml: {}, drawer: true }),
 					st('1k', 'Request reference', 'Mobile scrolled to the reference card. On desktop it is visible below the table.', l({}), { scroll: 900 })
 				],
 				tables: [tb('Copy: Variants list', [
diff --git a/docs/design/source/VariantsFrame.dc.html b/docs/design/source/VariantsFrame.dc.html
index c892351..5e9e921 100644
--- a/docs/design/source/VariantsFrame.dc.html
+++ b/docs/design/source/VariantsFrame.dc.html
@@ -86,10 +86,15 @@ class Component extends DCLogic {
 		// ---------- shell
 		const NAV = [['home', 'house', 'Home'], ['articles', 'file-text', 'Articles'], ['media', 'images', 'Media'], ['users', 'users', 'Users'], ['integration', 'plug', 'Integration'], ['settings', 'settings', 'Settings']]
 		const nav = s.role === 'user' ? NAV.filter(n => ['home', 'articles', 'media'].includes(n[0])) : NAV
-		const side = D('width:224px;flex-shrink:0;background:var(--ui-bg);border-right:1px solid var(--ui-border);display:flex;flex-direction:column;padding:12px;gap:2px',
-			D('display:flex;align-items:center;gap:10px;height:40px;padding:0 6px;margin-bottom:10px', mark(26), S('font-weight:600;font-size:14px;color:var(--ui-text-highlighted)', 'RenewCMS')),
-			...nav.map(([k, ic, t]) => D('display:flex;align-items:center;gap:10px;height:32px;padding:0 10px;background:' + (k === s.nav ? 'var(--rc-sand)' : 'transparent') + ';color:' + (k === s.nav ? 'var(--rc-on-sand)' : 'var(--ui-text-toned)') + ';font-weight:' + (k === s.nav ? 500 : 400), I(ic), t)),
-			D('flex:1'), D('display:flex;align-items:center;gap:10px;height:40px;padding:0 6px;color:var(--ui-text-highlighted)', S('width:26px;height:26px;flex-shrink:0;background:var(--rc-sand);color:var(--rc-on-sand);display:flex;align-items:center;justify-content:center;font:600 11px \'IBM Plex Sans\',sans-serif', 'MA'), S('flex:1;font-weight:500', 'Marta Alves'), I('chevrons-up-down', 14)))
+		const Side = dr => {
+			const open = s.nav === 'settings' || s.sideOpen, act = s.nav === 'settings' ? (s.crumbs || []).slice(-1)[0] : null, h = dr ? 44 : 32
+			const row = (ic, t, on, pl, tail, hi) => D('display:flex;align-items:center;gap:10px;height:' + h + 'px;padding:0 10px 0 ' + pl + 'px;background:' + (on ? 'var(--rc-sand)' : 'transparent') + ';color:' + (on ? 'var(--rc-on-sand)' : hi ? 'var(--ui-text-highlighted)' : 'var(--ui-text-toned)') + ';font-weight:' + (on || hi ? 500 : 400), I(ic, pl > 10 ? 14 : undefined), S('flex:1', t), tail)
+			return D('width:' + (dr ? '100%' : '224px') + ';height:' + (dr ? '100%' : 'auto') + ';flex-shrink:0;background:var(--ui-bg);' + (dr ? 'box-shadow:var(--rc-shadow-modal);' : 'border-right:1px solid var(--ui-border);') + 'display:flex;flex-direction:column;padding:12px;gap:2px',
+				D('display:flex;align-items:center;gap:10px;height:40px;padding:0 6px;margin-bottom:10px', mark(26), S('flex:1;font-weight:600;font-size:14px;color:var(--ui-text-highlighted)', 'RenewCMS'), dr && I('x', 20)),
+				...nav.flatMap(([k, ic, t]) => k !== 'settings' ? [row(ic, t, k === s.nav, 10)] : [row(ic, t, false, 10, I(open ? 'chevron-down' : 'chevron-right', 14), open), open && D('display:flex;flex-direction:column;gap:2px;margin-left:19px;border-left:1px solid var(--ui-border)', S('padding:6px 10px 2px 12px;font-size:11px;line-height:16px;font-weight:600;letter-spacing:.04em;text-transform:uppercase;color:var(--ui-text-muted)', 'Media'), row('layers', 'Variants', act === 'Variants', 12), row('database', 'Cache', act === 'Cache', 12))]),
+				D('flex:1'), D('display:flex;align-items:center;gap:10px;height:40px;padding:0 6px;color:var(--ui-text-highlighted)', S('width:26px;height:26px;flex-shrink:0;background:var(--rc-sand);color:var(--rc-on-sand);display:flex;align-items:center;justify-content:center;font:600 11px \'IBM Plex Sans\',sans-serif', 'MA'), S('flex:1;font-weight:500', 'Marta Alves'), I('chevrons-up-down', 14)))
+		}
+		const side = Side(false)
 		const crumbs = s.crumbs || []
 		const topbar = m
 			? D('height:56px;flex-shrink:0;border-bottom:1px solid var(--ui-border);background:var(--ui-bg);display:flex;align-items:center;padding:0 6px;gap:4px;color:var(--ui-text-highlighted)', S('width:44px;height:44px;display:flex;align-items:center;justify-content:center', I(s.back ? 'arrow-left' : 'menu', 20)), S('flex:1;font-weight:600;font-size:16px;overflow:hidden;text-overflow:ellipsis;white-space:nowrap', s.mTitle || crumbs[crumbs.length - 1]))
@@ -319,6 +324,7 @@ class Component extends DCLogic {
 			k === 'edit' && (m ? D('position:absolute;inset:0;z-index:40;display:flex', EditPanel()) : D('position:absolute;inset:0;z-index:40;display:flex;justify-content:flex-end;background:var(--rc-overlay)', EditPanel())),
 			k === 'detail' && (DT.preview ? [DetailPanel(), PrevDlg()] : DetailPanel()),
 			k === 'editor' && ED.picker && Picker(),
+			m && s.drawer && D('position:absolute;inset:0;z-index:60;display:flex;background:var(--rc-overlay)', D('width:300px;max-width:85%;height:100%', Side(true))),
 			s.modal && Modal(), s.toasts && Toasts())
 		return { view: root }
 	}
diff --git a/features/image_variants_screens.feature b/features/image_variants_screens.feature
new file mode 100644
index 0000000..bc56ce1
--- /dev/null
+++ b/features/image_variants_screens.feature
@@ -0,0 +1,690 @@
+Feature: Image variants settings screens, list and add/edit slide-over
+
+  As an owner or admin of a RenewCMS site
+  I want to list, enable, disable, purge, delete, add and edit image variants from Settings → Media
+  So that I can manage the named sizes articles request with ?v=<name> without leaving the back office
+
+  Background:
+    Given the spec of record is docs/design/screens/image-variants.md sections 1 and 2 and its "Back-office API errors" table, the board docs/design/source/RenewCMS Screens Image variants.dc.html drawn by VariantsFrame.dc.html, and docs/design/routes.md
+    And this slice is SPA only: no Go change, and the API is the one of features/image-variants.feature
+    And it excludes the Cache tab content, the Media library additions, the image detail Variants tab and the editor picker (sections 3 to 6 of the design)
+    And /settings/media/variants is a verified route rendered as VariantsPage inside DashboardShell, with the sidebar item "Settings" current
+    And the desktop breadcrumb is "Settings › Media › Variants" and the mobile top bar title is "Variants"
+    And the page uses Nuxt UI components only and design tokens, with no raw hex value and no arbitrary Tailwind colour
+    And every new English string has a French entry in web/src/i18n/messages.ts
+    And the list comes from GET /v1/image-variants once per navigation, and items are used in the order the API returns (name ascending)
+    And the Default fixture holds six variants, in API order, with cache_size in bytes (1 MB = 1048576):
+      | name   | width | height | fit     | format   | quality | generated_files | cache_size       | enabled |
+      | card   | 800   | null   | inside  | webp     | 80      | 318             | 58 MB            | true    |
+      | hero   | 1200  | 630    | cover   | webp     | 82      | 244             | 84 MB            | true    |
+      | og     | 1200  | 630    | cover   | jpeg     | 80      | 96              | 9 MB             | true    |
+      | print  | null  | 2400   | inside  | png      | null    | 74              | 21 MB            | false   |
+      | square | 600   | 600    | cover   | jpeg     | 85      | 140             | 19 MB            | true    |
+      | thumb  | 400   | 300    | cover   | webp     | 80      | 412             | 21 MB            | true    |
+    And the session user has role "owner" or "admin" from GET /v1/auth/me unless a scenario says otherwise
+    And plain-text API errors are mapped by status, never shown raw
+
+  Rule: Only admins and owners see the page
+
+    Scenario Outline: A session whose role is not owner or admin gets the Forbidden state
+      Given the session has <session>
+      When the user opens /settings/media/variants
+      Then the sidebar shows no current item
+      And the page shows the empty block with a lock icon, the title "You don't have access" and the text "Only admins can manage image variants. Ask an admin if you need one changed."
+      And it offers one button "Back to Home" with an arrow-left icon
+      And no page header, no tabs, no table, no cards and no reference card are drawn
+      And <request>
+
+      Examples:
+        | session                     | request                                           |
+        | no role                     | no request to GET /v1/image-variants is sent      |
+        | role "owner" but the API answers 403 to the list | the request was sent and its 403 is handled here |
+
+    Scenario: Back to Home leaves the page
+      Given the Forbidden state is shown
+      When the user activates "Back to Home"
+      Then the route is /home
+
+    Scenario Outline: An owner or an admin sees the list
+      Given the session role is "<role>"
+      When the user opens /settings/media/variants
+      Then GET /v1/image-variants is sent once and the page header is shown
+
+      Examples:
+        | role  |
+        | owner |
+        | admin |
+
+  Rule: Header and tabs
+
+    Scenario: The page header and the tabs
+      When the Default fixture is loaded
+      Then the title is "Image variants"
+      And the description is "Named sizes and formats generated from your original images. Originals are never changed."
+      And a primary button "Add variant" with a plus icon is shown, right of the title on desktop and below the description on mobile
+      And two tabs follow the header: "Variants" (icon layers, active, medium weight, 2 px primary underline) and "Cache" (icon database, toned text), the Cache tab is aria-disabled="true", activating it changes nothing and no route exists for it
+
+  Rule: Loaded, table on desktop and cards on mobile
+
+    Scenario: Desktop table
+      Given the viewport is 640 px wide or more
+      When the Default fixture is loaded
+      Then a table has the columns "Name", "Dimensions", "Fit", "Format", "Quality", "Generated", "Cache size", "Status" and an unlabeled actions column
+      And the grid is minmax(0,1.1fr) 104px 76px 72px 68px 92px 92px 132px 44px, the header is 36 px high on --ui-bg-elevated and rows are at least 48 px high with a top border
+      And the rows are, in order, with cells name | dimensions | fit | format | quality | generated | cache size | status:
+        | card   | 800 × auto | inside | WebP | 80 | 318 | 58 MB | Enabled  |
+        | hero   | 1200×630   | cover  | WebP | 82 | 244 | 84 MB | Enabled  |
+        | og     | 1200×630   | cover  | JPEG | 80 | 96  | 9 MB  | Enabled  |
+        | print  | auto × 2400| inside | PNG  | —  | 74  | 21 MB | Disabled |
+        | square | 600×600    | cover  | JPEG | 85 | 140 | 19 MB | Enabled  |
+        | thumb  | 400×300    | cover  | WebP | 80 | 412 | 21 MB | Enabled  |
+      And the name and dimensions cells are IBM Plex Mono, the name 13 px medium and the dimensions 12 px
+      And the row of a disabled variant has muted text
+      And the footer under the table reads "6 variants · 1,284 generated files · 212 MB"
+      And below the footer the Request reference card is visible
+
+    Scenario Outline: Dimensions, quality and format cells
+      Given a variant with width <width>, height <height>, format <format> and quality <quality>
+      Then the Dimensions cell reads "<dimensions>", the Format cell reads "<label>" and the Quality cell reads "<qualityCell>"
+
+      Examples:
+        | width | height | format   | quality | dimensions  | label    | qualityCell |
+        | 400   | 300    | webp     | 80      | 400×300     | WebP     | 80          |
+        | 800   | null   | jpeg     | 80      | 800 × auto  | JPEG     | 80          |
+        | null  | 2400   | png      | null    | auto × 2400 | PNG      | —           |
+        | 600   | 600    | original | 82      | 600×600     | Original | 82          |
+
+    Scenario: Mobile cards
+      Given the viewport is below 640 px
+      When the Default fixture is loaded
+      Then each variant is a card with 12 px padding and a 1 px border, stacked with 8 px gaps
+      And the first line of the card "hero" is the name in IBM Plex Mono 14 px medium with the status switch at its right
+      And the second line is the mono 12 px spec line "1200×630 · cover · WebP · q82"
+      And the third line is "244 generated · 84 MB" with the row menu button at its right
+      And the card "print" spec line is "auto × 2400 · inside · PNG" with no quality part
+      And the footer text "6 variants · 1,284 generated files · 212 MB" follows the last card
+      And the Request reference card follows the footer, in one column
+
+    Scenario: Singular footer
+      Given the list holds only "thumb" with 1 generated file of 18 KB
+      Then the footer reads "1 variant · 1 generated file · 18 KB"
+
+    Scenario: Footer sums are computed from the list
+      Given the Default fixture
+      Then the footer file count is the sum of generated_files and the size is the sum of cache_size
+
+  Rule: Loading
+
+    Scenario: Skeletons appear only after 150 ms
+      Given GET /v1/image-variants has not answered
+      Then nothing is drawn in the content area at 149 ms
+      And at 150 ms the header and tabs stay, and a region announces "Loading variants" with aria-busy="true"
+      And on desktop it holds a 36 px header bar and 5 skeleton rows of 48 px with six bars
+      And below 640 px it holds 4 skeleton cards with three bars of 40 %, 70 % and 55 % width
+      And no text is drawn in the skeleton
+
+    Scenario: A fast answer never flashes skeletons
+      Given GET /v1/image-variants answers before 150 ms
+      Then no skeleton is ever drawn
+
+  Rule: Empty
+
+    Scenario: No variants
+      Given GET /v1/image-variants answers {"items": []}
+      Then the header and tabs are shown
+      And the empty block has a layers icon, the title "No variants yet" and the text "A variant is a named size that an image can be requested in, like ?v=thumb. Start with one of these."
+      And two template cards sit side by side on desktop and stacked on mobile (at least 64 px high):
+        | thumb | 400×300 · cover · WebP   | Use template |
+        | hero  | 1200×630 · cover · WebP  | Use template |
+      And a primary button "Add variant" with a plus icon follows them
+      And no table, footer or Request reference card is drawn
+
+    Scenario Outline: A template opens the form pre-filled
+      Given the empty state is shown
+      When the user activates the template <template>
+      Then the Add variant form opens in create mode with name "<template>", width <width>, height <height>, fit cover, format WebP and quality <quality>
+      And generate on upload is off and enabled is on
+      And Save is enabled
+
+      Examples:
+        | template | width | height | quality |
+        | thumb    | 400   | 300    | 80      |
+        | hero     | 1200  | 630    | 82      |
+
+  Rule: Error loading
+
+    Scenario Outline: A failed list request
+      Given GET /v1/image-variants fails with <failure>
+      Then the header and tabs are shown
+      And an error alert shows the title "Couldn't load variants", the text "Check your connection and try again." and a button "Try again" with a rotate-cw icon
+      And the alert has no close button and no table, cards, footer or reference card are drawn
+
+      Examples:
+        | failure       |
+        | status 500    |
+        | a network failure |
+
+    Scenario: Try again reloads
+      Given the error alert is shown
+      When the user activates "Try again"
+      Then GET /v1/image-variants is sent again and the Default fixture replaces the alert
+
+  Rule: Status switch
+
+    Scenario: Each row has a labelled switch paired with an icon and a word
+      When the Default fixture is loaded
+      Then every row shows a switch (32 × 18 px) and the icon circle-check with "Enabled" or the icon circle-off with "Disabled"
+      And the switch of "hero" has the accessible name "Enable variant hero"
+
+    Scenario Outline: Toggling sends PATCH and updates the row
+      Given the variant "<name>" is <before>
+      When the user toggles its switch
+      Then PATCH /v1/image-variants/<name> is sent with {"enabled": <after>}
+      And while it is in flight the switch is disabled
+      And when it answers 200 the status reads "<label>" and the other fields of the row are unchanged
+      And no purge happens and generated_files and cache_size are those of the response
+
+      Examples:
+        | name  | before   | after | label    |
+        | hero  | enabled  | false | Disabled |
+        | print | disabled | true  | Enabled  |
+
+    Scenario Outline: A failed toggle reverts and reports
+      Given the variant "hero" is enabled
+      When the user toggles its switch and the API answers <status>
+      Then the switch and the word return to "Enabled"
+      And a toast shows the title "<title>" and the text "<text>"
+
+      Examples:
+        | status | title                 | text                                                                              |
+        | 403    | You don't have access | Only admins can manage image variants.                                            |
+        | 404    | Not found             | This variant or image no longer exists. Refresh the page.                         |
+        | 500    | Something went wrong  | The server couldn't finish. Try again. If it keeps happening, check the server log. |
+
+  Rule: Row menu
+
+    Scenario: The ellipsis opens a three-item menu
+      When the user activates the ellipsis button of the row "hero" (accessible name and tooltip "Actions for hero")
+      Then a 176 px menu opens at the right of the row with the items "Edit" (pencil), "Purge cache" (eraser) and "Delete" (trash-2, error colour)
+      And on desktop items are 32 px high and on mobile 44 px high
+      And the ellipsis button shows a primary focus ring while the menu is open
+
+    Scenario: Menu keyboard behaviour
+      Given the menu is open
+      Then the arrow keys move between items, Enter activates the focused item and Escape closes the menu with focus back on the ellipsis button
+
+    Scenario Outline: Menu items
+      Given the menu of "hero" is open
+      When the user chooses "<item>"
+      Then <result>
+
+      Examples:
+        | item        | result                                           |
+        | Edit        | the add/edit slide-over opens in edit mode for "hero" |
+        | Purge cache | the purge dialog opens                           |
+        | Delete      | the delete dialog opens                          |
+
+  Rule: Purge cache
+
+    Scenario: The purge dialog
+      When the purge dialog of "hero" opens (hero has 244 files and 84 MB)
+      Then the title is "Purge cache for “hero”?"
+      And the text is "This removes 244 generated files (84 MB). Files are generated again on the next request."
+      And the buttons are "Cancel" and a primary "Purge 244 files"
+      And focus is trapped in the dialog and returns to the ellipsis button on close
+
+    Scenario: Cancel closes without a request
+      When the user activates "Cancel" or presses Escape
+      Then the dialog closes, no request is sent and the row is unchanged
+
+    Scenario: Confirming purges while the row is dimmed
+      When the user activates "Purge 244 files"
+      Then POST /v1/image-variants/hero/purge is sent
+      And the dialog closes
+      And the row "hero" is on --ui-bg-elevated, its switch and ellipsis button are disabled and its status cell reads "Purging…" with a loader-circle icon in the info colour
+      And the other rows stay interactive
+
+    Scenario: Purge succeeds
+      Given the API answers 200 {"purged_files": 244, "purged_bytes": 88080384}
+      Then the row "hero" shows Generated 0 and Cache size 0 KB, its status returns to Enabled and its controls are active
+      And the footer is recomputed with no refetch
+      And a toast reads "Purged 244 files from “hero”" (the count comes from the response)
+
+    Scenario Outline: Purge fails
+      When the purge answers <status>
+      Then the row returns to its previous values and controls
+      And a toast shows "<title>" and "<text>"
+
+      Examples:
+        | status | title                | text                                                                                |
+        | 404    | Not found            | This variant or image no longer exists. Refresh the page.                           |
+        | 500    | Something went wrong | The server couldn't finish. Try again. If it keeps happening, check the server log. |
+
+  Rule: Delete variant
+
+    Scenario: The delete dialog
+      When the delete dialog of "hero" opens
+      Then the title is "Delete variant “hero”?"
+      And the text is "This removes the variant and its 244 generated files (84 MB). Articles that use ?v=hero will start returning 400. This can't be undone."
+      And the buttons are "Cancel" and a danger "Delete variant"
+
+    Scenario: Confirming shows a spinner and blocks dismissal
+      When the user activates "Delete variant"
+      Then DELETE /v1/image-variants/hero is sent
+      And the confirm button shows a loader-circle icon and "Cancel" is disabled
+      And Escape and a backdrop click do not close the dialog
+
+    Scenario: Delete succeeds
+      Given the API answers 204
+      Then the dialog closes, the row "hero" is removed, the footer reads "5 variants · 1,040 generated files · 128 MB"
+      And a toast reads "Variant “hero” deleted"
+
+    Scenario: Deleting the last variant shows the empty state
+      Given only "thumb" exists and DELETE answers 204
+      Then the "No variants yet" empty state replaces the table
+
+    Scenario Outline: Delete fails
+      When the delete answers <status>
+      Then the dialog closes, the row stays [404: the list is reloaded], and a toast shows "<title>" and "<text>"
+
+      Examples:
+        | status | title                | text                                                                                |
+        | 404    | Not found            | This variant or image no longer exists. Refresh the page.                           |
+        | 500    | Something went wrong | The server couldn't finish. Try again. If it keeps happening, check the server log. |
+
+  Rule: Request reference card
+
+    Scenario: The card under the table
+      Given the list is loaded
+      Then a card titled "How requests are handled" shows two columns on desktop (1.3fr / 1fr, 16 px gap) and one on mobile
+      And the left column is a bordered table (rows at least 36 px, 44 px on mobile):
+        | /static/uploadedImages/photo.png?v=thumb | 200 | Image                 |
+        | Unknown or disabled variant              | 400 | Unknown variant       |
+        | width, height, format or quality         | 400 | Unsupported parameter |
+        | Missing source image                     | 404 | Not found             |
+      And the first cell is mono 12 px
+      And the 200 badge is success-soft with circle-check and the 400 and 404 badges are error-soft with circle-x
+      And the right column has the muted label "Body of a 400 response" over a mono 12 px block reading exactly:
+        """
+        {
+          "status": 400,
+          "error": "unknown_variant",
+          "message": "Unknown variant",
+          "detail": "banner"
+        }
+        """
+      And the note "unsupported_parameter replaces unknown_variant when a raw parameter is sent. There is no arbitrary-size mode." closes the card
+
+    Scenario: The card is not drawn when there is no list
+      Given the state is Loading, Empty, Error or Forbidden
+      Then the Request reference card is absent
+
+  Rule: Slide-over opening and closing
+
+    Scenario: Add variant opens the slide-over on desktop
+      Given the viewport is 640 px wide or more
+      When the user activates "Add variant"
+      Then a slide-over 960 px wide opens at the right over an overlay, the list stays behind it
+      And its header is 56 px high with the title "Add variant" and a close button (x icon, accessible name "Close")
+      And its body has the form on the left (440 px column) and the preview on the right on --ui-bg-muted, separated by a border
+      And its footer is 64 px high with "Cancel" and a primary "Add variant", and the status text is empty
+      And focus moves to the Name field
+
+    Scenario: Add variant opens a full page on mobile
+      Given the viewport is below 640 px
+      When the user activates "Add variant"
+      Then a full-screen page opens with a 56 px header holding an arrow-left back button and the title "Add variant", no x button
+      And the form is followed by the Preview section, stacked, separated by a top border
+      And the footer is 72 px high with "Cancel" and "Add variant" sharing the width
+
+    Scenario: Edit opens with the stored values
+      When the user chooses "Edit" on the row "hero"
+      Then the title is "Edit variant: hero"
+      And Name is "hero" in a locked, elevated field with a lock icon and the help "The name can't be changed."
+      And Width 1200, Height 630, Fit Cover, Format WebP, Quality 82, Generate on upload off and Enabled on are shown
+      And the always-visible warning alert reads "Changing dimensions, fit, format or quality purges 244 generated files; they will be regenerated on next request."
+      And "Save changes" is disabled and the footer status is empty
+
+    Scenario: Dismissing a pristine form closes immediately
+      Given a form with no change
+      When the user activates "Cancel", the close button or presses Escape
+      Then the slide-over closes with no dialog and focus returns to the opener
+
+    Scenario: Dismissing a dirty form asks first
+      Given the form is dirty
+      When the user activates "Cancel", the close button, the back arrow or presses Escape
+      Then a dialog opens with the title "Discard changes?" and the text "You have unsaved changes to “hero”. If you close now, they're lost." in edit mode
+      And its buttons are "Keep editing" and a danger "Discard changes"
+      And "Keep editing" returns to the form with its values
+      And "Discard changes" closes the slide-over and discards the values
+
+    Scenario: The discard text names the new variant in create mode
+      Given the form is dirty in create mode with name "banner"
+      When the user closes it
+      Then the text reads "You have unsaved changes to “banner”. If you close now, they're lost."
+      And with an empty name the text reads "You have unsaved changes. If you close now, they're lost."
+
+  Rule: Form states
+
+    Scenario: Create: pristine
+      When Add variant has just opened
+      Then Name is empty and focused (primary border and 1 px primary ring) with the placeholder "e.g. hero" and the help "Lowercase letters, numbers and dashes. Can't be changed later."
+      And Width and Height are empty with the placeholder "auto", the suffix "px" and the help "Set a width, a height, or both. 1–8000 px. Images are never enlarged."
+      And Fit is a horizontal 3-option radio group, Cover selected, with the help "Fills the box and crops what overflows."
+      And Format is a select showing "Original" with the help "Keeps the format of each source image."
+      And Quality shows a slider and a number field at 80 with the help "1–100. Higher is sharper and larger."
+      And the switch "Generate on upload" (help "Creates this variant when an image is uploaded.") is off
+      And the switch "Enabled" (help "Disabled variants return 400 on the public site.") is on
+      And "Add variant" in the footer is disabled
+      And the Preview shows "Set a width or height to see a preview." over the sample
+
+    Scenario Outline: The Fit help follows the selection
+      When Fit <fit> is selected
+      Then the help reads "<help>"
+
+      Examples:
+        | fit     | help                                                       |
+        | Cover   | Fills the box and crops what overflows.                    |
+        | Contain | Whole image inside the box, padded to the box size.        |
+        | Inside  | Whole image inside the box, no padding.                    |
+
+    Scenario: The Name counter
+      When the user types "hero"
+      Then a mono counter "4/32" shows at the right of the label; in edit mode there is no counter
+
+    Scenario: Create: dirty with valid values
+      Given the user typed name "hero", Width 1200, Height 630, Format WebP, Quality 82, Generate on upload on
+      Then "Add variant" is enabled and the footer status reads "Unsaved changes" with a circle-dot icon
+      And the Preview shows the comparison, its chips and the estimate (see Preview rules)
+
+    Scenario Outline: Field errors show on blur and on submit
+      When the user enters <value> in <field> and leaves it
+      Then the field has an error border and the inline message "<message>" with a circle-alert icon
+      And the help text is replaced by the message
+      And once an error shows it is revalidated on every input and clears when the value is valid
+
+      Examples:
+        | field   | value        | message                                                        |
+        | Name    | Hero banner  | Use lowercase letters, numbers and dashes, 2 to 32 characters. |
+        | Name    | a            | Use lowercase letters, numbers and dashes, 2 to 32 characters. |
+        | Name    | 33 letters   | Use lowercase letters, numbers and dashes, 2 to 32 characters. |
+        | Width   | 9000         | Enter a value from 1 to 8000.                                  |
+        | Width   | 0            | Enter a value from 1 to 8000.                                  |
+        | Height  | 8001         | Enter a value from 1 to 8000.                                  |
+        | Quality | 140          | Enter a value from 1 to 100.                                   |
+        | Quality | 0            | Enter a value from 1 to 100.                                   |
+
+    Scenario Outline: Valid boundary values show no error
+      Then <field> <value> shows no error
+      Examples:
+        | field   | value |
+        | Name    | ab    |
+        | Name    | a-b-c |
+        | Width   | 1     |
+        | Height  | 8000  |
+        | Quality | 1     |
+        | Quality | 100   |
+
+    Scenario: Submitting with several errors sends nothing
+      Given name "Hero banner", Width 9000, Height 630, Format WebP, Quality 140
+      When the user activates "Add variant"
+      Then the three errors of the Field errors scenario show (Name format, "Enter a value from 1 to 8000." under Width, "Enter a value from 1 to 100." under Quality)
+      And no request is sent and focus moves to the first invalid field
+
+    Scenario: No dimension
+      Given name "banner", Width and Height both empty, Format WebP
+      When the user activates "Add variant"
+      Then the message "Set a width, a height, or both." shows under Width, and the Height field has an error border without text
+      And the default help under the two fields is hidden
+      And no request is sent
+
+    Scenario: PNG hides Quality
+      When Format PNG is selected
+      Then the Quality section (slider, number field and help) is not rendered
+      And the estimate and output label follow the PNG rules
+      And the POST or PUT body has no "quality" key
+
+    Scenario: Switching back from PNG restores the previous quality
+      Given Quality was 70 before PNG was selected
+      When Format WebP is selected again
+      Then Quality shows 70
+
+    Scenario: The Quality slider and field stay in sync
+      When the slider moves to 60
+      Then the number field reads 60
+      When the number field is set to 90
+      Then the slider fill is at 90 %
+
+  Rule: Saving a new variant
+
+    Scenario: Add sends POST with the form values
+      Given name "hero", Width 1200, Height 630, Fit Cover, Format WebP, Quality 82, Generate on upload on, Enabled on
+      When the user activates "Add variant"
+      Then POST /v1/image-variants is sent with {"name": "hero", "width": 1200, "height": 630, "fit": "cover", "format": "webp", "quality": 82, "generate_on_upload": true, "enabled": true}
+
+    Scenario: An empty Width or Height is sent as null or omitted
+      Given name "card", Width 800, Height empty
+      Then the body has "width": 800 and no positive "height"
+      And an empty dimension is omitted or null in the body, both being valid for the API
+
+    Scenario: While saving, the form is locked
+      Given the POST is in flight
+      Then every field, switch and select is disabled at 60 % opacity
+      And "Cancel" is disabled and the primary button reads "Saving…" with a loader-circle icon
+      And Escape, the close button and a backdrop click do not close the slide-over
+
+    Scenario: A successful create
+      Given the API answers 201 with the variant
+      Then the slide-over closes, the new row is inserted in name order without a refetch with Generated 0 and Cache size 0 KB, the footer is recomputed
+      And a toast reads "Variant “hero” added"
+      And focus returns to "Add variant"
+
+    Scenario: A create from the empty state leaves the empty state
+      Given the list was empty and a create answers 201
+      Then the table shows one row and the footer reads "1 variant · 0 generated files · 0 KB"
+
+    Scenario: Name already taken (409)
+      Given name "thumb" and the API answers 409 with "A variant named “thumb” already exists. Choose another name."
+      Then the slide-over stays open and the Name field has an error border with the message "A variant named “thumb” already exists. Choose another name."
+      And all values are kept, focus is on Name, the form is re-enabled and no alert or toast is shown
+      And editing the name clears the message
+
+    Scenario Outline: Save error
+      Given the API fails with <failure>
+      Then the slide-over stays open with all values kept and the form re-enabled
+      And an error alert at the top of the form shows the title "Couldn't save the variant", the text "Check your connection and try again." and a button "Try again"
+      And "Try again" repeats the same request; the alert disappears when the request starts
+
+      Examples:
+        | failure           |
+        | status 500        |
+        | a network failure |
+
+    Scenario Outline: Other statuses on save
+      Given the API answers <status> to the save
+      Then the slide-over stays open with values kept and a toast shows "<title>" and "<text>"
+
+      Examples:
+        | status | title                 | text                                                                              |
+        | 400    | Check the request     | A value in the request isn't valid. Reload the page and try again.                |
+        | 403    | You don't have access | Only admins can manage image variants.                                            |
+        | 404    | Not found             | This variant or image no longer exists. Refresh the page.                         |
+
+    Scenario Outline: A 422 from the server is shown inline
+      Given the API answers 422 with the plain text "<server text>"
+      Then the message "<inline>" shows under <field>
+
+      Examples:
+        | server text                                                               | inline                                                         | field          |
+        | Use lowercase letters, numbers and dashes, 2 to 32 characters.            | Use lowercase letters, numbers and dashes, 2 to 32 characters. | Name           |
+        | Width and height must be between 1 and 8000, and one of them is required. | Set a width, a height, or both.                                | Width          |
+        | Quality must be between 1 and 100.                                        | Enter a value from 1 to 100.                                   | Quality        |
+        | Fit must be cover, contain or inside.                                     | the "Couldn't save the variant" alert                          | the form top   |
+
+  Rule: Saving an edit
+
+    Scenario: Edit: dirty
+      Given the user changes Quality from 82 to 70 on "hero"
+      Then "Save changes" is enabled, the footer status reads "Unsaved changes", the Quality number reads 70
+      And the output label reads "1200×630 · about 71 KB"
+      And the warning alert stays visible
+
+    Scenario: Save sends PUT with the complete definition
+      When the user activates "Save changes"
+      Then PUT /v1/image-variants/hero is sent with {"width": 1200, "height": 630, "fit": "cover", "format": "webp", "quality": 70, "generate_on_upload": false, "enabled": true} and no "name"
+
+    Scenario: A successful edit reports the purge
+      Given the API answers 200 with quality 70, generated_files 0, cache_size 0 and "purged_files": 244
+      Then the slide-over closes, the row "hero" is updated in place without a refetch (quality 70, Generated 0, Cache size 0 KB)
+      And a toast reads "Variant “hero” saved. 244 files purged."
+
+    Scenario: A switch-only edit says nothing about purging
+      Given the user turned "Generate on upload" on only and the API answers 200 with "purged_files": 0
+      Then the toast reads "Variant “hero” saved."
+
+    Scenario: Saving while saving and the save error behave as in create
+      Then the Saving, 409-free error, other-status and Try again behaviours of the create rule apply with PUT
+
+  Rule: Preview and ImageCompare
+
+    Scenario: Preview layout
+      Then the Preview heading "Preview" is followed, right-aligned and muted, by "Sample: north-wall.jpg"
+      And the compare box is a 3:2 box with a 1 px border and hidden overflow
+      And two labels sit under it: "Original" over "4032 × 3024 · 3.9 MB", and the variant name in mono over "1200×630 · about 96 KB"
+      And the hint "Drag the divider, or focus it and use the arrow keys. The estimate comes from a sample; output is never larger than the source." follows
+      And the images are placeholders, not real photos
+
+    Scenario: Compare box content
+      Given name "hero", Width 1200, Height 630
+      Then the original placeholder fills the box and the variant placeholder covers the part right of the divider (clip-path inset(0 0 0 50%))
+      And a chip "Original" sits 8 px from the top-left and a mono chip "hero" 8 px from the top-right
+      And the divider is a 2 px line at 50 % with a 32 px square handle (44 px on mobile) holding a chevrons-left-right icon centred on it
+
+    Scenario: ImageCompare is a native range input
+      Then the slider is an input type="range" with min 0, max 100, step 1, value 50
+      And it has the accessible name "Compare original and hero" and aria-valuetext "50% hero"
+      And aria-valuenow is 50
+
+    Scenario Outline: Keyboard behaviour
+      Given the slider has focus at value <start>
+      When the user presses <keys>
+      Then the value is <end> and aria-valuetext is "<end>% hero"
+      And the divider and the clip move to <end> %
+
+      Examples:
+        | start | keys             | end |
+        | 50    | ArrowRight       | 51  |
+        | 50    | ArrowUp          | 51  |
+        | 50    | ArrowLeft        | 49  |
+        | 50    | ArrowDown        | 49  |
+        | 50    | Shift+ArrowRight | 60  |
+        | 50    | Shift+ArrowLeft  | 40  |
+        | 50    | Home             | 0   |
+        | 50    | End              | 100 |
+        | 100   | ArrowRight       | 100 |
+        | 0     | ArrowLeft        | 0   |
+        | 95    | Shift+ArrowRight | 100 |
+        | 5     | Shift+ArrowLeft  | 0   |
+
+    Scenario: Focus ring
+      When the slider has keyboard focus
+      Then the handle shows a 2 px primary outline with a 2 px offset
+      And the slider keeps its value when the form fields change
+
+    Scenario: Pointer dragging
+      When the user drags the handle to the middle of the right half
+      Then the value becomes 75 and the divider follows
+
+    Scenario: No dimension, no comparison
+      Given Width and Height are both empty
+      Then the compare box shows only the original placeholder, with no variant layer, no divider, no handle and no variant chip
+      And the overlay reads "Set a width or height to see a preview." 12 px from the left, right and bottom
+      And the variant label reads "name" over "No output yet" [the board's placeholder name]
+
+    Scenario Outline: Output size, never enlarged
+      Given the sample is 4032 × 3024
+      When the form has Width <w>, Height <h> and Fit <fit>
+      Then the output label dimensions read "<out>"
+
+      Examples:
+        | w    | h    | fit     | out       |
+        | 1200 | 630  | cover   | 1200×630  |
+        | 800  |      | cover   | 800×600   |
+        |      | 2400 | inside  | 3200×2400 |
+        | 600  | 600  | contain | 600×600   |
+        | 1000 | 1000 | inside  | 1000×750  |
+        | 8000 | 8000 | cover   | 4032×3024 |
+
+    Scenario Outline: Size estimate
+      Given the sample north-wall.jpg
+      When the form has name "<name>", <w>×<h> <fit>, Format <format>, Quality <quality>
+      Then the label reads "<out> · about <estimate>"
+
+      Examples:
+        | name  | w    | h   | fit   | format | quality | out      | estimate |
+        | hero  | 1200 | 630 | cover | WebP   | 82      | 1200×630 | 96 KB    |
+        | hero  | 1200 | 630 | cover | WebP   | 70      | 1200×630 | 71 KB    |
+        | hero  | 1200 | 630 | cover | PNG    | n/a     | 1200×630 | 310 KB   |
+        | thumb | 400  | 300 | cover | WebP   | 80      | 400×300  | 18 KB    |
+
+    Scenario: The estimate follows quality and format
+      Then a lower quality gives a smaller or equal estimate for the same size and format
+      And the estimate never exceeds the original size 3.9 MB
+
+    Scenario: The sample name and slider labels follow the name
+      Given the name is empty and a width is set
+      Then the chip and label use the placeholder "name" and the slider's accessible name reads "Compare original and name"
+
+  Rule: URL and copy
+
+    Scenario: The URL row
+      Given the name is "hero"
+      Then the label "URL" is followed by a read-only mono 12 px box reading "/static/uploadedImages/north-wall.jpg?v=hero" on --ui-bg-elevated, and a button "Copy" with a copy icon
+
+    Scenario: Without a name
+      Given the name is empty
+      Then the box reads "/static/uploadedImages/north-wall.jpg?v=<name>" in muted text and "Copy" is disabled
+
+    Scenario: Copy writes the URL
+      Given the name is "hero"
+      When the user activates "Copy"
+      Then the clipboard receives the displayed URL
+      And the button reads "Copied" with a check icon
+      And it returns to "Copy" with the copy icon after a short delay (tested with fake timers)
+
+    Scenario: A clipboard failure does not claim success
+      Given navigator.clipboard.writeText rejects
+      Then the button keeps "Copy" and the page raises no error alert
+
+    Scenario: In edit mode the URL uses the locked name
+      Given the edit form of "hero"
+      Then the URL box reads "/static/uploadedImages/north-wall.jpg?v=hero" and "Copy" is enabled
+
+  Rule: Accessibility and hygiene
+
+    Scenario: Status is never colour alone
+      Then every status shows an icon and a word, and dialogs trap focus and return it to the opener
+
+    Scenario: Touch targets on mobile
+      Given the viewport is below 640 px
+      Then buttons, menu items, the switch rows, form controls and the slider handle are at least 44 px high
+
+    Scenario: Vocabulary
+      Then the screens say "variant", "generated" and "purge", never "thumbnail preset", "version" or "rendition"
+
+    Scenario: Hygiene
+      Then no comment is added to any file, and the new components use only Nuxt UI parts and the existing tokens (the only new token allowed is --rc-on-sand, already exported)
+
+  Rule: Estimate module, French and row order
+
+    Scenario: The estimator is one replaceable module
+      Then the size estimate coefficients live in a single named module under the variants area
+      And every place that shows an estimate labels it "about N KB"
+      And the Preview components import the estimate only through that module
+
+    Scenario: French strings
+      Given the locale is French
+      Then every new string of these screens has a French entry in web/src/i18n/messages.ts and no English string appears in the UI
+
+    Scenario: Row order
+      Then tests use the API order (by name) and only the visual-check mock uses the board order
diff --git a/features/image_variants_screens.qa.md b/features/image_variants_screens.qa.md
new file mode 100644
index 0000000..a1a3a94
--- /dev/null
+++ b/features/image_variants_screens.qa.md
@@ -0,0 +1,156 @@
+# QA: Image variants settings screens
+
+## Implementation note for coder (informational, not a QA assertion)
+
+The API is built and covered by features/image-variants.qa.md: this slice has no Go change and no HTTP-level
+section. The auth requirement "admin" does not exist in router meta (AuthRequirement is
+public | session | verified | any); the role check lives in VariantsPage via the session role from
+GET /v1/auth/me. Plain-text API errors are read through ApiError.body; never display the raw body.
+Sizes: the new formatter is not formatSize. Every new string has an English and a
+French entry in web/src/i18n/messages.ts.
+
+## Automated (Vitest + Vue Test Utils, `task test:web`)
+
+Mock useApi's `request` per case (GET /v1/image-variants, POST /v1/image-variants, PUT, PATCH,
+DELETE, POST .../purge); no backend. Mount VariantsPage inside DashboardShell with a resolved verified
+session (id 1, username "marta", role "owner") and a test router at /settings/media/variants.
+Default fixture = the Background's 6 variants in API order. Mock `matchMedia` for the 640 px
+breakpoint; run layout cases at desktop and below-640. Use fake timers for the 150 ms skeleton delay.
+Mock navigator.clipboard. No test freezes the system date (this screen shows no date).
+
+1. **Access, Examples-driven** — session without role; role "owner"; role "admin"; list answering
+   ApiError(403). Assert the Forbidden copy and "Back to Home" (navigates to /home) and that no list
+   request is sent when the role is missing; assert the page header for owner and admin.
+2. **Header and tabs** — title, description, "Add variant", tabs "Variants" (active) and "Cache"
+   (aria-disabled, click does nothing), breadcrumb "Settings", "Media", "Variants" and
+   mobile title "Variants".
+3. **Loaded, desktop** — column labels, the 6 rows in order with every cell of the table, "—" for
+   print, "Disabled" for print, muted text on the disabled row, footer "6 variants · 1,284 generated
+   files · 212 MB", the reference card.
+4. **Cell formats, Examples-driven** — the four dimension/quality/format cases.
+5. **Loaded, mobile** — 6 cards, the spec lines (`1200×630 · cover · WebP · q82`, print without a
+   quality part), "244 generated · 84 MB", the footer after the cards, the reference card.
+6. **Footer** — Default sums; a one-variant list "1 variant · 1 generated file · 18 KB"; an
+   after-delete recompute "5 variants · 1,040 generated files · 128 MB".
+7. **Loading** — unresolved GET: nothing at 149 ms; at 150 ms the region with aria-busy and the label
+   "Loading variants", 5 skeleton rows on desktop / 4 cards below 640, no text; a response at 100 ms never
+   draws skeletons.
+8. **Empty** — copy, the two template cards, "Add variant", no reference card; each template opens
+   the form with its values (thumb 400×300 cover WebP 80; hero 1200×630 cover WebP 82).
+9. **Error, Examples-driven** — ApiError(500) and NetworkError: alert copy, "Try again", no close
+   button, no table; Try again re-sends GET and renders the Default fixture.
+10. **Status switch** — accessible name "Enable variant hero"; toggling hero sends `PATCH
+    /v1/image-variants/hero {"enabled": false}`, switch disabled while in flight, row shows Disabled,
+    no toast; print on sends `{"enabled": true}`; failures 403/404/500 revert the switch and raise
+    the toast copy of the table.
+11. **Row menu** — items Edit/Purge cache/Delete in order, ArrowDown/Up and Enter, Escape closes and
+    returns focus to the ellipsis button; Edit opens the edit form, the others open their dialog.
+12. **Purge** — dialog copy for hero ("Purge 244 files", "84 MB"); Cancel/Escape send nothing; confirm
+    sends `POST /v1/image-variants/hero/purge`, closes the dialog, row dimmed with "Purging…" and
+    disabled controls while others stay active; resolve `{purged_files: 244, purged_bytes: 88080384}`
+    -> row 0 files, status Enabled, toast "Purged 244 files from “hero”"; failures 404/500 -> row restored + toast.
+13. **Delete** — dialog copy; confirm sends `DELETE /v1/image-variants/hero`; spinner, Cancel
+    disabled, Escape and backdrop blocked; 204 -> row removed, toast `Variant “hero” deleted`, footer
+    recompute; deleting the last row shows Empty; failures 404 (reloads the list) / 500 -> toast.
+14. **Reference card** — the 4 rows with badge words and icons, the exact JSON block text, the note;
+    absent in Loading/Empty/Error/Forbidden; one column below 640.
+15. **Slide-over open/close** — desktop slide-over vs mobile full page (back arrow, no x), titles
+    "Add variant" / "Edit variant: hero", focus on Name, pristine close without dialog, dirty close
+    via Cancel/x/back/Escape opens "Discard changes?" with the right text, Keep editing / Discard
+    changes behaviours, focus return to the opener.
+16. **Create: pristine** — all labels, placeholders, helps, defaults (Fit Cover, Format Original,
+    Quality 80, Generate off, Enabled on), "Add variant" disabled, overlay "Set a width or height to
+    see a preview.".
+17. **Fit help, Examples-driven** — three helps.
+18. **Field errors, Examples-driven** — each name/width/height/quality row of the feature; blur and
+    submit; revalidation on input; boundary values accepted; several errors at once: no request.
+19. **No dimension** — copy under Width, error border on Height, default help hidden, no request.
+20. **PNG** — Quality hidden, body without "quality", quality restored after switching back.
+21. **Quality slider/number sync**.
+22. **Create request** — exact POST body for the hero values; the `201` flow inserts the row in
+    name order without a second GET, footer recomputed, toast `Variant “hero” added`.
+23. **Saving** — fields disabled, "Saving…", Escape/x/backdrop blocked.
+24. **409** — inline message with the name, values kept, no alert and no toast, cleared on edit.
+25. **Save error, Examples-driven** — ApiError(500) and NetworkError: alert copy; Try again repeats the
+    request; values kept.
+26. **Other statuses, Examples-driven** — 400, 403, 404 toasts.
+27. **422, Examples-driven** — the four server sentences and their inline/alert mapping.
+28. **Edit: pristine** — locked Name with help, stored values, warning alert text with 244, Save
+    disabled.
+29. **Edit: dirty and save** — quality 82 -> 70: estimate "about 71 KB", Save enabled, PUT body
+    without "name", 200 with purged_files 244 -> row updated in place, toast "Variant “hero” saved. 244 files
+    purged."; purged_files 0 -> "Variant “hero” saved.".
+30. **Preview layout** — heading, sample text, labels, hint, chips "Original" and the name, handle size
+    (44 px class on mobile).
+31. **ImageCompare keyboard, Examples-driven** — role/type range, min 0 max 100 step 1, value 50,
+    aria-label "Compare original and hero", aria-valuetext "50% hero"; every key row of the feature,
+    including clamping; valuetext and clip-path/divider position follow the value; pointer input sets it.
+32. **ImageCompare empty** — no dimensions: no variant layer, divider or handle; overlay text.
+33. **Output size and estimate, Examples-driven** — the six size rows and the four estimate rows;
+    monotonic quality; never above 3.9 MB.
+34. **URL** — URL text with and without a name, Copy disabled without a name, click writes the
+    displayed URL, label "Copied" with fake timers and back to "Copy", a rejected clipboard keeps "Copy".
+35. **French** — `setLocale('fr')`; every key used on the page exists in messages.ts (a catalogue
+    test) and the page renders without missing keys.
+36. **Vocabulary** — no rendered text contains "thumbnail preset", "version" or "rendition".
+
+## Visual (task visual:check -- image-variants, desktop and mobile, light and dark)
+
+Reference: docs/design/screens/image-variants.md, board "Image variants" in
+`docs/design/source/RenewCMS Screens Image variants.dc.html`, exact values in
+`docs/design/source/VariantsFrame.dc.html` and `AppFrame.dc.html`. Add each state to
+`web/visual/states.ts` with the board's data. The gate is hard: every non-skipped capture within 10 %,
+both viewports, both themes. All states below use the board's sample data; none is clock-sensitive,
+so none is skipped.
+
+Sample data (from the board): the 6 variants of the Background (thumb 412 files 21 MB, card 318/58 MB,
+hero 244/84 MB, square 140/19 MB, og 96/9 MB, print 74/21 MB), board row order as listed in
+VariantsFrame (thumb, card, hero, square, og, print); (the board orders by creation, the API by name;
+the mock must return the board order for the visual capture only). Session name "Marta Alves".
+Preview sample: north-wall.jpg, 4032 × 3024, 3.9 MB.
+
+- [ ] 1a Loaded (desktop table, mobile cards, reference card on desktop)
+- [ ] 1b Loading
+- [ ] 1c Empty with the two templates
+- [ ] 1d Error loading
+- [ ] 1e Forbidden (session without role, no nav item current)
+- [ ] 1f Row menu (hero)
+- [ ] 1g Row action in progress (hero "Purging…")
+- [ ] 1h Purge confirm
+- [ ] 1i Delete confirm
+- [ ] 1j Delete in progress
+- [ ] 1k Request reference (mobile scrolled 900 px; desktop shows it under the table)
+- [ ] 2a Create: pristine
+- [ ] 2b Create: dirty (hero, slider focused, mobile scrolled to the preview, estimate 96 KB)
+- [ ] 2c Field errors (name "Hero banner", width 9000, height 630, quality 140)
+- [ ] 2d No dimension (name "banner")
+- [ ] 2e Name already taken (name "thumb", 400×300, estimate 18 KB)
+- [ ] 2f Saving
+- [ ] 2g Save error
+- [ ] 2h Edit: pristine
+- [ ] 2i Edit: dirty (quality 70, estimate 71 KB)
+- [ ] 2j Unsaved changes (discard dialog over 2i)
+- [ ] 2k PNG: no quality (estimate 310 KB)
+- [ ] Layout, taken from the board frame (VariantsFrame.dc.html), not components.md: table grid
+      `minmax(0,1.1fr) 104px 76px 72px 68px 92px 92px 132px 44px`, 36 px header, 48 px rows; cards 12 px
+      padding with the name+switch line, the spec line, then count+menu; slide-over 960 px with a
+      440 px form column; compare box 3:2, chips 8 px from the top corners, handle 32 px (44 px on
+      mobile) centred on a 2 px divider; footer 64 px (72 px on mobile).
+- [ ] Not drawn, no visual state: toggle failures, the purge/delete failure toasts, the 409-free
+      status toasts, the 422 mapping, the clipboard states "Copied" (add only if the board draws it: it
+      does not, so Vitest only), singular footer.
+- [ ] Not covered by screenshots: keyboard and focus order (Tab reaches Add variant, tabs, each row's
+      switch and ellipsis; the slide-over focus starts on Name and is trapped; Escape rules), slider
+      keys by hand, hover/active, motion (slide-over, dialogs, skeleton pulse stopped under reduced
+      motion).
+
+## Manual verification
+
+- **Round trips against `task dev`**: create, edit (PUT with a purge), toggle, purge and delete a real
+  variant; confirm rows, counts and sizes after a reload match the API (needs generated files from a
+  real `/static/uploadedImages/<storedName>?v=<name>` request).
+- **Role**: sign in as an owner and as an admin; confirm both reach the page. A session without a role
+  is not reproducible live (only owner/admin exist); covered by Vitest and the visual state.
+- **Real clipboard** in a secure context (localhost): Copy then paste.
+- **French**: switch the language and read every state, the dialogs and the toasts.
+- **Real public URL**: paste the copied URL on a stored image and confirm it serves the variant.
diff --git a/web/src/components/DashboardShell.vue b/web/src/components/DashboardShell.vue
index c2c48c0..376456c 100644
--- a/web/src/components/DashboardShell.vue
+++ b/web/src/components/DashboardShell.vue
@@ -25,6 +25,7 @@ const props = withDefaults(
 		compactPadding?: boolean
 		bleedOfflineBanner?: boolean
 		renderWhileChecking?: boolean
+		noCurrentNav?: boolean
 		offlineMessage?: string
 		offlineIcon?: string
 	}>(),
@@ -39,6 +40,7 @@ const props = withDefaults(
 		compactPadding: false,
 		bleedOfflineBanner: false,
 		renderWhileChecking: false,
+		noCurrentNav: false,
 	},
 )
 
@@ -62,6 +64,26 @@ const session = useSessionStore()
 const update = useUpdateStore()
 const api = useApi()
 
+const canManageMedia = computed(
+	() => session.session?.role === 'owner' || session.session?.role === 'admin',
+)
+
+const settingsChildren = computed(() => [
+	{ label: t('Media'), type: 'label' as const },
+	{
+		label: t('Variants'),
+		to: '/settings/media/variants',
+		icon: 'i-lucide-layers',
+		active: !props.noCurrentNav && route.path === '/settings/media/variants',
+	},
+	{
+		label: t('Cache'),
+		icon: 'i-lucide-database',
+		disabled: true,
+		active: !props.noCurrentNav && route.path === '/settings/media/cache',
+	},
+])
+
 const navItems = computed(() =>
 	[
 		{
@@ -114,10 +136,23 @@ const navItems = computed(() =>
 			icon: 'i-lucide-settings',
 			slot: 'settings',
 		},
-	].map((item) => ({
-		...item,
-		active: route.path === item.to || route.path.startsWith(`${item.to}/`),
-	})),
+	].map((item) => {
+		const isSettings = item.to === '/settings'
+		const parentActive = isSettings
+			? route.path === item.to
+			: route.path === item.to || route.path.startsWith(`${item.to}/`)
+		return {
+			...item,
+			active: !props.noCurrentNav && parentActive,
+			...(isSettings && canManageMedia.value
+				? {
+						children: settingsChildren.value,
+						defaultOpen: route.path.startsWith(item.to),
+						trailingIcon: 'i-lucide-chevron-right',
+					}
+				: {}),
+		}
+	}),
 )
 
 const routeTitle = computed(() => translate((route.meta.title as string) ?? ''))
@@ -135,8 +170,13 @@ const navUi = computed(() => ({
 	list: 'flex flex-col gap-0.5',
 	link: sidebarCollapsed.value
 		? 'h-8 justify-center gap-0 px-0 text-sm'
-		: 'h-8 gap-2.5 px-2.5 py-0 text-sm',
+		: 'h-8 gap-2.5 px-2.5 py-0 text-sm [li[data-state=open]>&]:font-medium [li[data-state=open]>&]:text-highlighted',
 	linkLeadingIcon: 'size-4',
+	linkTrailingIcon: 'size-3.5 group-data-[state=open]:rotate-90',
+	label: 'px-2.5 pt-1.5 pb-0.5 pl-3 text-[11px] leading-4 font-semibold tracking-[.04em] text-muted uppercase',
+	childList: 'ms-[19px] gap-0.5 border-s border-default ps-0',
+	childLink: 'h-8 gap-2.5 py-0 pr-2.5 pl-3 text-sm',
+	childLinkIcon: 'size-3.5',
 }))
 const loggingOut = ref(false)
 const sidebarOpen = ref(false)
diff --git a/web/src/components/__tests__/DashboardShell.spec.ts b/web/src/components/__tests__/DashboardShell.spec.ts
index 058789a..bc3c990 100644
--- a/web/src/components/__tests__/DashboardShell.spec.ts
+++ b/web/src/components/__tests__/DashboardShell.spec.ts
@@ -20,6 +20,7 @@ interface ShellOptions {
 	username?: string
 	displayName?: string
 	email?: string
+	role?: string
 	width?: number
 }
 
@@ -30,13 +31,14 @@ async function mountShell(path: string, options: ShellOptions = {}) {
 		username = 'marta',
 		displayName = '',
 		email = 'marta@renew.example',
+		role = undefined,
 		width = DESKTOP_WIDTH,
 	} = options
 	localStorage.clear()
 	setViewportWidth(width)
 	setActivePinia(createPinia())
 	vi.mocked(useApi).mockReturnValue({
-		getMe: vi.fn().mockResolvedValue({ verified: true, username, email, displayName }),
+		getMe: vi.fn().mockResolvedValue({ verified: true, username, email, displayName, role }),
 		request: vi.fn().mockResolvedValue(undefined),
 	})
 	await router.push(path)
@@ -382,3 +384,41 @@ describe('Account menu: opened from the drawer on mobile', () => {
 		expect(router.currentRoute.value.path).toBe('/login')
 	})
 })
+
+describe('DashboardShell Settings expands to the Media subpages', () => {
+	it.each(['owner', 'admin'])(
+		'shows Media: Variants and Cache under Settings for %s on /settings',
+		async (role) => {
+			const wrapper = await mountShell('/settings', { role })
+
+			const nav = wrapper.find('nav[aria-label="Main"]')
+			expect(nav.text()).toContain('Media')
+			const variants = nav.find('a[href="/settings/media/variants"]')
+			expect(variants.text()).toContain('Variants')
+			expect(variants.attributes('aria-current')).toBeUndefined()
+			const cache = nav
+				.findAll('[aria-disabled="true"], [disabled]')
+				.find((el) => el.text().includes('Cache'))
+			expect(cache).toBeDefined()
+			expect(nav.find('a[href="/settings"]').attributes('aria-current')).toBe('page')
+		},
+	)
+
+	it('marks Variants current and Settings not current on the variants page', async () => {
+		const wrapper = await mountShell('/settings/media/variants', { role: 'admin' })
+
+		const nav = wrapper.find('nav[aria-label="Main"]')
+		expect(nav.find('a[href="/settings/media/variants"]').attributes('aria-current')).toBe(
+			'page',
+		)
+		expect(nav.find('a[href="/settings"]').attributes('aria-current')).toBeUndefined()
+	})
+
+	it('shows no Media subpages without an owner or admin role', async () => {
+		const wrapper = await mountShell('/settings', { role: 'user' })
+
+		const nav = wrapper.find('nav[aria-label="Main"]')
+		expect(nav.find('a[href="/settings/media/variants"]').exists()).toBe(false)
+		expect(nav.text()).not.toContain('Cache')
+	})
+})
diff --git a/web/src/components/variants/ImageCompare.vue b/web/src/components/variants/ImageCompare.vue
new file mode 100644
index 0000000..98cc027
--- /dev/null
+++ b/web/src/components/variants/ImageCompare.vue
@@ -0,0 +1,115 @@
+<script setup lang="ts">
+import { t } from '@/i18n'
+
+import { computed } from 'vue'
+
+const MIN = 0
+const MAX = 100
+const STEP = 1
+const LARGE_STEP = 10
+const PATTERN =
+	'bg-[repeating-linear-gradient(135deg,color-mix(in_srgb,var(--ui-text-muted)_15%,transparent)_0_1px,transparent_1px_12px)]'
+const VARIANT_PATTERN =
+	'bg-[repeating-linear-gradient(45deg,color-mix(in_srgb,var(--ui-text-muted)_25%,transparent)_0_2px,transparent_2px_6px)]'
+const CHIP =
+	'absolute top-2 flex h-5 items-center border border-accented bg-default px-1.5 text-xs font-medium text-highlighted'
+
+const props = defineProps<{
+	name: string
+	comparable: boolean
+}>()
+
+const position = defineModel<number>({ default: 50 })
+
+const shownName = computed(() => props.name || t('name'))
+
+function clamp(value: number) {
+	return Math.min(MAX, Math.max(MIN, value))
+}
+
+function onInput(event: Event) {
+	position.value = clamp(Number((event.target as HTMLInputElement).value))
+}
+
+function stepFor(event: KeyboardEvent) {
+	return event.shiftKey ? LARGE_STEP : STEP
+}
+
+const KEY_ACTIONS: Record<string, (event: KeyboardEvent) => number> = {
+	ArrowRight: (event) => position.value + stepFor(event),
+	ArrowUp: (event) => position.value + stepFor(event),
+	ArrowLeft: (event) => position.value - stepFor(event),
+	ArrowDown: (event) => position.value - stepFor(event),
+	Home: () => MIN,
+	End: () => MAX,
+}
+
+function onKeydown(event: KeyboardEvent) {
+	const action = KEY_ACTIONS[event.key]
+	if (!action) {
+		return
+	}
+	event.preventDefault()
+	position.value = clamp(action(event))
+}
+</script>
+
+<template>
+	<div
+		data-testid="image-compare"
+		class="relative aspect-3/2 shrink-0 overflow-hidden border border-default"
+	>
+		<div
+			data-testid="compare-original"
+			class="absolute inset-0 flex items-center justify-center bg-(--ui-color-secondary-200) text-muted dark:bg-(--ui-color-secondary-300)"
+			:class="PATTERN"
+		>
+			<UIcon name="i-lucide-image" class="size-8 opacity-55" />
+		</div>
+		<template v-if="comparable">
+			<div
+				data-testid="compare-variant"
+				class="absolute inset-0 bg-accented"
+				:class="VARIANT_PATTERN"
+				:style="{ clipPath: `inset(0 0 0 ${position}%)` }"
+			/>
+			<span :class="[CHIP, 'left-2']">{{ t('Original') }}</span>
+			<span :class="[CHIP, 'right-2 font-mono']">{{ shownName }}</span>
+			<input
+				type="range"
+				:min="MIN"
+				:max="MAX"
+				:step="STEP"
+				:value="position"
+				:aria-label="t('Compare original and {0}', [shownName])"
+				:aria-valuenow="position"
+				:aria-valuetext="t('{0}% {1}', [position, shownName])"
+				class="peer absolute inset-0 z-10 size-full cursor-ew-resize opacity-0"
+				@input="onInput"
+				@keydown="onKeydown"
+			/>
+			<div
+				data-testid="compare-divider"
+				aria-hidden="true"
+				class="pointer-events-none absolute inset-y-0 -ml-px w-0.5 bg-default outline outline-accented"
+				:style="{ left: `${position}%` }"
+			/>
+			<span
+				data-testid="compare-handle"
+				aria-hidden="true"
+				class="pointer-events-none absolute top-1/2 flex size-8 -translate-x-1/2 -translate-y-1/2 items-center justify-center border border-accented bg-default text-highlighted peer-focus-visible:outline-2 peer-focus-visible:outline-offset-2 peer-focus-visible:outline-primary max-sm:size-11"
+				:style="{ left: `${position}%` }"
+			>
+				<UIcon name="i-lucide-chevrons-left-right" class="size-4" />
+			</span>
+		</template>
+		<template v-else>
+			<span :class="[CHIP, 'left-2']">{{ t('Original') }}</span>
+			<p
+				class="absolute right-3 bottom-3 left-3 border border-default bg-default px-3 py-2 text-toned"
+			>
+				{{ t('Set a width or height to see a preview.') }}
+			</p>
+		</template>
+	</div>
+</template>
diff --git a/web/src/components/variants/RequestReferenceCard.vue b/web/src/components/variants/RequestReferenceCard.vue
new file mode 100644
index 0000000..bfaddb8
--- /dev/null
+++ b/web/src/components/variants/RequestReferenceCard.vue
@@ -0,0 +1,113 @@
+<script setup lang="ts">
+import { t } from '@/i18n'
+
+import { computed } from 'vue'
+
+const SAMPLE_PATH = '/static/uploadedImages/photo.png?v=thumb'
+const ERROR_BODY = `{
+  "status": 400,
+  "error": "unknown_variant",
+  "message": "Unknown variant",
+  "detail": "banner"
+}`
+
+const rows = computed(() => [
+	{ request: SAMPLE_PATH, status: 200, result: t('Image'), mono: true },
+	{
+		request: t('Unknown or disabled variant'),
+		status: 400,
+		result: t('Unknown variant'),
+		mono: false,
+	},
+	{
+		request: t('width, height, format or quality'),
+		status: 400,
+		result: t('Unsupported parameter'),
+		mono: false,
+	},
+	{ request: t('Missing source image'), status: 404, result: t('Not found'), mono: false },
+])
+
+const columns = [
+	{ id: 'request', header: '' },
+	{ id: 'status', header: '', meta: { class: { td: 'w-15.5' } } },
+	{ id: 'result', header: '', meta: { class: { td: 'w-30 sm:w-32.5' } } },
+]
+
+function isSuccess(status: number) {
+	return status === 200
+}
+</script>
+
+<template>
+	<UCard
+		data-testid="request-reference"
+		:ui="{
+			root: 'rounded-none border border-default bg-default ring-0',
+			body: 'flex flex-col gap-3 p-4 sm:p-4',
+		}"
+	>
+		<h2 class="font-semibold text-highlighted">{{ t('How requests are handled') }}</h2>
+		<div class="grid grid-cols-1 gap-4 sm:grid-cols-[minmax(0,1.3fr)_minmax(0,1fr)]">
+			<div class="border border-default">
+				<UTable
+					:data="rows"
+					:columns="columns"
+					:ui="{
+						base: 'w-full table-fixed',
+						thead: 'hidden',
+						separator: 'hidden',
+						td: 'h-11 whitespace-normal px-0 py-1.5 first:pl-3 sm:h-9',
+						tbody: 'divide-y-0',
+						tr: 'border-t border-muted first:border-t-0',
+					}"
+				>
+					<template #request-cell="{ row }">
+						<span
+							class="block pr-2.5 text-highlighted"
+							:class="
+								row.original.mono ? 'font-mono text-xs break-all' : 'break-words'
+							"
+							>{{ row.original.request }}</span
+						>
+					</template>
+					<template #status-cell="{ row }">
+						<UBadge
+							color="neutral"
+							variant="soft"
+							:icon="
+								isSuccess(row.original.status)
+									? 'i-lucide-circle-check'
+									: 'i-lucide-circle-x'
+							"
+							:class="
+								isSuccess(row.original.status)
+									? 'bg-(--rc-success-soft) text-success'
+									: 'bg-(--rc-error-soft) text-error'
+							"
+							:ui="{ base: 'h-5 gap-1 px-1.5 py-0 text-xs', leadingIcon: 'size-3' }"
+							>{{ row.original.status }}</UBadge
+						>
+					</template>
+					<template #result-cell="{ row }">
+						<span class="text-toned">{{ row.original.result }}</span>
+					</template>
+				</UTable>
+			</div>
+			<div class="flex flex-col gap-1.5">
+				<span class="text-xs/5 text-muted">{{ t('Body of a 400 response') }}</span>
+				<pre
+					class="m-0 overflow-hidden bg-elevated p-3 font-mono text-xs/4.5 text-highlighted"
+					>{{ ERROR_BODY }}</pre
+				>
+			</div>
+		</div>
+		<p class="text-xs/5 text-muted">
+			{{
+				t(
+					'unsupported_parameter replaces unknown_variant when a raw parameter is sent. There is no arbitrary-size mode.',
+				)
+			}}
+		</p>
+	</UCard>
+</template>
diff --git a/web/src/components/variants/VariantCardList.vue b/web/src/components/variants/VariantCardList.vue
new file mode 100644
index 0000000..1df87e2
--- /dev/null
+++ b/web/src/components/variants/VariantCardList.vue
@@ -0,0 +1,69 @@
+<script setup lang="ts">
+import { computed } from 'vue'
+import VariantRowMenu from '@/components/variants/VariantRowMenu.vue'
+import VariantStatusSwitch from '@/components/variants/VariantStatusSwitch.vue'
+import type { ImageVariant } from '@/composables/useImageVariants'
+import { generatedLine, specLine, variantsSummary } from '@/lib/variants/variantFormat'
+
+const props = defineProps<{
+	items: ImageVariant[]
+	isEnabled: (item: ImageVariant) => boolean
+	isLocked: (name: string) => boolean
+	isPurging: (name: string) => boolean
+}>()
+
+const emit = defineEmits<{
+	toggle: [name: string, value: boolean]
+	edit: [name: string]
+	purge: [name: string]
+	delete: [name: string]
+}>()
+
+const summary = computed(() => variantsSummary(props.items))
+
+function nameTone(item: ImageVariant) {
+	return props.isEnabled(item) ? 'text-highlighted' : 'text-muted'
+}
+</script>
+
+<template>
+	<div class="flex flex-col gap-2">
+		<UCard
+			v-for="item in items"
+			:key="item.name"
+			data-testid="variant-card"
+			:ui="{
+				root: 'rounded-none border border-default ring-0',
+				body: 'flex flex-col gap-1.5 p-3 sm:p-3',
+			}"
+			:class="props.isPurging(item.name) ? 'bg-elevated' : 'bg-default'"
+		>
+			<div class="flex items-center gap-2">
+				<span
+					class="min-w-0 flex-1 truncate font-mono text-base/5 font-medium"
+					:class="nameTone(item)"
+					>{{ item.name }}</span
+				>
+				<VariantStatusSwitch
+					:name="item.name"
+					:enabled="isEnabled(item)"
+					:purging="isPurging(item.name)"
+					:locked="isLocked(item.name)"
+					@toggle="emit('toggle', item.name, $event)"
+				/>
+			</div>
+			<span class="font-mono text-xs/5 text-toned">{{ specLine(item) }}</span>
+			<div class="flex items-center">
+				<span class="flex-1 text-muted">{{ generatedLine(item) }}</span>
+				<VariantRowMenu
+					:name="item.name"
+					:disabled="isPurging(item.name)"
+					@edit="emit('edit', item.name)"
+					@purge="emit('purge', item.name)"
+					@delete="emit('delete', item.name)"
+				/>
+			</div>
+		</UCard>
+		<p data-testid="variants-summary" class="py-1 text-muted">{{ summary }}</p>
+	</div>
+</template>
diff --git a/web/src/components/variants/VariantFormFields.vue b/web/src/components/variants/VariantFormFields.vue
new file mode 100644
index 0000000..dfaed78
--- /dev/null
+++ b/web/src/components/variants/VariantFormFields.vue
@@ -0,0 +1,394 @@
+<script setup lang="ts">
+import { t } from '@/i18n'
+
+import { computed } from 'vue'
+import type { FormMode } from '@/composables/useVariantForm'
+import type { VariantFit, VariantFormat } from '@/composables/useImageVariants'
+import {
+	NAME_MAX_LENGTH,
+	QUALITY_MAX,
+	QUALITY_MIN,
+	sliderValue,
+	usesQuality,
+	type FieldErrors,
+	type FieldName,
+	type VariantFormValues,
+} from '@/lib/variants/variantForm'
+
+const FIELD_BASE =
+	'h-11 px-3 text-lg ring-inset focus:ring-2 focus:ring-primary aria-invalid:focus:ring-error disabled:bg-elevated disabled:text-highlighted disabled:opacity-60 sm:h-10 sm:text-sm'
+const FIELD_UI = { help: 'text-xs leading-5', error: 'text-xs leading-5' }
+const MONO_FIELD = `${FIELD_BASE} font-mono`
+const ERROR_ROW = 'flex items-start gap-1.5'
+
+const values = defineModel<VariantFormValues>('values', { required: true })
+
+const props = defineProps<{
+	errors: FieldErrors
+	mode: FormMode
+	disabled: boolean
+	dimensionHelpHidden: boolean
+	generatedFiles: number
+	saveFailed: boolean
+}>()
+
+const emit = defineEmits<{ blur: [field: FieldName]; retry: [] }>()
+
+const isEdit = computed(() => props.mode === 'edit')
+const showCounter = computed(() => !isEdit.value && values.value.name !== '')
+
+const fitOptions = computed(() => [
+	{ value: 'cover', label: t('Cover') },
+	{ value: 'contain', label: t('Contain') },
+	{ value: 'inside', label: t('Inside') },
+])
+
+const fitHelp = computed(() => {
+	const helps: Record<VariantFit, string> = {
+		cover: t('Fills the box and crops what overflows.'),
+		contain: t('Whole image inside the box, padded to the box size.'),
+		inside: t('Whole image inside the box, no padding.'),
+	}
+	return helps[values.value.fit]
+})
+
+const formatOptions = computed(() => [
+	{ value: 'original', label: t('Original') },
+	{ value: 'jpeg', label: 'JPEG' },
+	{ value: 'png', label: 'PNG' },
+	{ value: 'webp', label: 'WebP' },
+])
+
+const showQuality = computed(() => usesQuality(values.value.format))
+
+const qualityModel = computed({
+	get: () => sliderValue(values.value.quality),
+	set: (value: number) => {
+		values.value.quality = String(value)
+	},
+})
+
+const editWarning = computed(() =>
+	props.generatedFiles === 1
+		? t(
+				'Changing dimensions, fit, format or quality purges 1 generated file; it will be regenerated on next request.',
+			)
+		: t(
+				'Changing dimensions, fit, format or quality purges {0} generated files; they will be regenerated on next request.',
+				[props.generatedFiles],
+			),
+)
+
+function setFit(value: unknown) {
+	values.value.fit = value as VariantFit
+}
+
+function setFormat(value: unknown) {
+	values.value.format = value as VariantFormat
+}
+</script>
+
+<template>
+	<div class="flex min-w-0 flex-col gap-4">
+		<UAlert
+			v-if="saveFailed"
+			role="alert"
+			color="error"
+			variant="soft"
+			orientation="vertical"
+			:close="false"
+			icon="i-lucide-circle-x"
+			:title="t('Couldn\'t save the variant')"
+			:description="t('Check your connection and try again.')"
+			:ui="{ actions: 'mt-2' }"
+		>
+			<template #actions>
+				<UButton
+					color="neutral"
+					variant="outline"
+					icon="i-lucide-rotate-cw"
+					class="h-11 gap-1.5 border border-accented bg-default px-2.5 text-xs text-highlighted ring-0 sm:h-7"
+					:ui="{ leadingIcon: 'size-3.5' }"
+					@click="emit('retry')"
+				>
+					{{ t('Try again') }}
+				</UButton>
+			</template>
+		</UAlert>
+
+		<UAlert
+			v-if="isEdit"
+			data-testid="edit-warning"
+			color="warning"
+			variant="soft"
+			:close="false"
+			icon="i-lucide-triangle-alert"
+			:description="editWarning"
+		/>
+
+		<div class="flex min-w-0 flex-col gap-4">
+			<UFormField
+				:ui="FIELD_UI"
+				data-field="name"
+				name="name"
+				:label="t('Name')"
+				:error="errors.name"
+				:help="
+					isEdit
+						? t('The name can\'t be changed.')
+						: t('Lowercase letters, numbers and dashes. Can\'t be changed later.')
+				"
+			>
+				<template v-if="showCounter" #hint>
+					<span data-testid="name-counter" class="font-mono text-xs">{{
+						`${values.name.length}/${NAME_MAX_LENGTH}`
+					}}</span>
+				</template>
+				<UInput
+					v-model="values.name"
+					:placeholder="t('e.g. hero')"
+					:readonly="isEdit"
+					:disabled="disabled"
+					:trailing-icon="isEdit ? 'i-lucide-lock' : undefined"
+					autocomplete="off"
+					class="w-full"
+					:class="{ 'opacity-100': isEdit }"
+					:ui="{
+						base: `${MONO_FIELD} ${isEdit ? 'bg-elevated' : ''}`,
+						trailingIcon: 'size-3.5 text-muted',
+					}"
+					@blur="emit('blur', 'name')"
+				/>
+				<template v-if="errors.name" #error="{ error }">
+					<span :class="ERROR_ROW"
+						><UIcon name="i-lucide-circle-alert" class="mt-0.75 size-3.5 shrink-0" />{{
+							error
+						}}</span
+					>
+				</template>
+			</UFormField>
+
+			<div class="flex flex-col gap-2">
+				<div class="grid grid-cols-2 gap-3">
+					<UFormField
+						:ui="FIELD_UI"
+						data-field="width"
+						name="width"
+						:label="t('Width')"
+						:error="errors.width"
+					>
+						<UInput
+							v-model="values.width"
+							inputmode="numeric"
+							:placeholder="t('auto')"
+							:disabled="disabled"
+							:color="errors.width ? 'error' : undefined"
+							:highlight="Boolean(errors.width)"
+							autocomplete="off"
+							class="w-full"
+							:ui="{ base: `${FIELD_BASE} pe-10`, trailing: 'pe-3' }"
+							@blur="emit('blur', 'width')"
+						>
+							<template #trailing>
+								<span class="font-mono text-sm text-muted">px</span>
+							</template>
+						</UInput>
+						<template v-if="errors.width" #error="{ error }">
+							<span :class="ERROR_ROW"
+								><UIcon
+									name="i-lucide-circle-alert"
+									class="mt-0.75 size-3.5 shrink-0"
+								/>{{ error }}</span
+							>
+						</template>
+					</UFormField>
+					<UFormField
+						:ui="FIELD_UI"
+						data-field="height"
+						name="height"
+						:label="t('Height')"
+						:error="errors.height"
+					>
+						<UInput
+							v-model="values.height"
+							inputmode="numeric"
+							:placeholder="t('auto')"
+							:disabled="disabled"
+							:color="errors.height || errors.dimension ? 'error' : undefined"
+							:highlight="Boolean(errors.height || errors.dimension)"
+							autocomplete="off"
+							class="w-full"
+							:ui="{ base: `${FIELD_BASE} pe-10`, trailing: 'pe-3' }"
+							@blur="emit('blur', 'height')"
+						>
+							<template #trailing>
+								<span class="font-mono text-sm text-muted">px</span>
+							</template>
+						</UInput>
+						<template v-if="errors.height" #error="{ error }">
+							<span :class="ERROR_ROW"
+								><UIcon
+									name="i-lucide-circle-alert"
+									class="mt-0.75 size-3.5 shrink-0"
+								/>{{ error }}</span
+							>
+						</template>
+					</UFormField>
+				</div>
+				<p v-if="!dimensionHelpHidden" class="text-xs/5 text-muted">
+					{{ t('Set a width, a height, or both. 1–8000 px. Images are never enlarged.') }}
+				</p>
+			</div>
+
+			<UFormField :ui="FIELD_UI" :label="t('Fit')" :help="fitHelp">
+				<URadioGroup
+					:model-value="values.fit"
+					:items="fitOptions"
+					:disabled="disabled"
+					variant="card"
+					orientation="horizontal"
+					:class="{ 'opacity-60': disabled }"
+					:ui="{
+						fieldset: 'grid grid-cols-3 gap-2',
+						item: 'min-h-11 items-center justify-center rounded-none border-accented p-0 text-highlighted has-data-[state=checked]:border-primary has-data-[state=checked]:bg-elevated sm:min-h-9',
+						container: 'sr-only',
+						wrapper: 'ms-0 w-auto',
+						label: 'flex items-center justify-center gap-1.5 font-normal text-highlighted',
+					}"
+					@update:model-value="setFit"
+				>
+					<template #label="{ item }">
+						<span
+							class="flex items-center gap-1.5"
+							:class="values.fit === item.value ? 'font-semibold' : ''"
+						>
+							<UIcon
+								v-if="values.fit === item.value"
+								name="i-lucide-check"
+								class="size-3.5"
+							/>
+							{{ item.label }}
+						</span>
+					</template>
+				</URadioGroup>
+			</UFormField>
+
+			<UFormField
+				:ui="FIELD_UI"
+				:label="t('Format')"
+				:help="
+					values.format === 'original'
+						? t('Keeps the format of each source image.')
+						: undefined
+				"
+			>
+				<USelect
+					:model-value="values.format"
+					:items="formatOptions"
+					:disabled="disabled"
+					class="w-full"
+					:ui="{
+						base: 'h-11 px-3 text-lg ring-inset disabled:bg-elevated disabled:text-highlighted disabled:opacity-60 sm:h-10 sm:text-sm',
+					}"
+					@update:model-value="setFormat"
+				/>
+			</UFormField>
+
+			<UFormField
+				v-if="showQuality"
+				:ui="FIELD_UI"
+				data-field="quality"
+				name="quality"
+				:label="t('Quality')"
+				:error="errors.quality"
+				:help="t('1–100. Higher is sharper and larger.')"
+			>
+				<div class="flex items-center gap-4" :class="{ 'opacity-60': disabled }">
+					<USlider
+						v-model="qualityModel"
+						:min="QUALITY_MIN"
+						:max="QUALITY_MAX"
+						:step="1"
+						:disabled="disabled"
+						:aria-label="t('Quality')"
+						class="flex-1"
+						:ui="{
+							root: 'h-11 sm:h-6',
+							track: 'h-1 rounded-none bg-accented',
+							range: 'rounded-none bg-primary',
+							thumb: 'size-4 rounded-none border-2 border-default bg-primary ring-0 outline outline-1 outline-primary',
+						}"
+					/>
+					<div class="pt-1.5">
+						<UInput
+							v-model="values.quality"
+							inputmode="numeric"
+							:aria-label="t('Quality')"
+							:disabled="disabled"
+							:color="errors.quality ? 'error' : undefined"
+							:highlight="Boolean(errors.quality)"
+							autocomplete="off"
+							class="w-21"
+							:ui="{ base: `${MONO_FIELD} disabled:opacity-100` }"
+							@blur="emit('blur', 'quality')"
+						/>
+					</div>
+				</div>
+				<template v-if="errors.quality" #error="{ error }">
+					<span :class="ERROR_ROW"
+						><UIcon name="i-lucide-circle-alert" class="mt-0.75 size-3.5 shrink-0" />{{
+							error
+						}}</span
+					>
+				</template>
+			</UFormField>
+
+			<div class="flex flex-col gap-3 pt-1">
+				<div class="flex min-h-8 items-start gap-3 max-sm:min-h-11">
+					<div class="flex min-w-0 flex-1 flex-col">
+						<span id="generate-on-upload-label" class="font-medium text-highlighted">{{
+							t('Generate on upload')
+						}}</span>
+						<span class="text-xs/5 text-muted">{{
+							t('Creates this variant when an image is uploaded.')
+						}}</span>
+					</div>
+					<div class="pt-0.5">
+						<USwitch
+							v-model="values.generateOnUpload"
+							:disabled="disabled"
+							aria-labelledby="generate-on-upload-label"
+							:ui="{
+								container: 'h-4.5',
+								base: 'relative h-4.5 w-8 before:absolute before:-inset-3.5 disabled:opacity-40 sm:before:hidden',
+								thumb: 'size-3.5 data-[state=checked]:translate-x-3.5',
+							}"
+						/>
+					</div>
+				</div>
+				<div class="flex min-h-8 items-start gap-3 max-sm:min-h-11">
+					<div class="flex min-w-0 flex-1 flex-col">
+						<span id="variant-enabled-label" class="font-medium text-highlighted">{{
+							t('Enabled')
+						}}</span>
+						<span class="text-xs/5 text-muted">{{
+							t('Disabled variants return 400 on the public site.')
+						}}</span>
+					</div>
+					<div class="pt-0.5">
+						<USwitch
+							v-model="values.enabled"
+							:disabled="disabled"
+							aria-labelledby="variant-enabled-label"
+							:ui="{
+								container: 'h-4.5',
+								base: 'relative h-4.5 w-8 before:absolute before:-inset-3.5 disabled:opacity-40 sm:before:hidden',
+								thumb: 'size-3.5 data-[state=checked]:translate-x-3.5',
+							}"
+						/>
+					</div>
+				</div>
+			</div>
+		</div>
+	</div>
+</template>
diff --git a/web/src/components/variants/VariantFormSlideover.vue b/web/src/components/variants/VariantFormSlideover.vue
new file mode 100644
index 0000000..6c4c53c
--- /dev/null
+++ b/web/src/components/variants/VariantFormSlideover.vue
@@ -0,0 +1,306 @@
+<script setup lang="ts">
+import { t } from '@/i18n'
+
+import { computed, nextTick, ref } from 'vue'
+import { useMediaQuery } from '@vueuse/core'
+import { useLocalizedOverlay } from '@/i18n/presentation'
+import ConfirmDialog from '@/components/ConfirmDialog.vue'
+import VariantFormFields from '@/components/variants/VariantFormFields.vue'
+import VariantPreview from '@/components/variants/VariantPreview.vue'
+import { ApiError } from '@/composables/useApi'
+import type { ImageVariant } from '@/composables/useImageVariants'
+import { useVariantForm, type FormMode } from '@/composables/useVariantForm'
+import { useVariantToasts } from '@/composables/useVariantToasts'
+import { isStatus } from '@/lib/variants/variantErrors'
+import {
+	toDefinition,
+	toNewVariant,
+	type FieldName,
+	type VariantFormValues,
+} from '@/lib/variants/variantForm'
+import { useImageVariantsStore } from '@/stores/imageVariants'
+
+const DESKTOP_QUERY = '(min-width: 40rem)'
+const CONFLICT = 409
+const UNPROCESSABLE = 422
+const TOAST_STATUSES = [400, 403, 404]
+
+const props = defineProps<{
+	mode: FormMode
+	initial: VariantFormValues
+	variant?: ImageVariant
+}>()
+
+const emit = defineEmits<{
+	close: []
+	saved: [result: { mode: FormMode; name: string; purgedFiles: number }]
+}>()
+
+const store = useImageVariantsStore()
+const overlay = useLocalizedOverlay()
+const { announceFailure } = useVariantToasts()
+const isDesktop = useMediaQuery(DESKTOP_QUERY)
+const form = useVariantForm(props.mode, props.initial)
+
+const saving = ref(false)
+const saveFailed = ref(false)
+const discardOpen = ref(false)
+
+const title = computed(() =>
+	props.mode === 'edit' ? t('Edit variant: {0}', [props.initial.name]) : t('Add variant'),
+)
+const primaryLabel = computed(() => {
+	if (saving.value) {
+		return t('Saving…')
+	}
+	return props.mode === 'edit' ? t('Save changes') : t('Add variant')
+})
+const discardDescription = computed(() =>
+	form.values.name
+		? t("You have unsaved changes to “{0}”. If you close now, they're lost.", [
+				form.values.name,
+			])
+		: t("You have unsaved changes. If you close now, they're lost."),
+)
+
+function focusField(field: FieldName) {
+	const target = document.querySelector<HTMLElement>(
+		`[data-field="${field}"] input:not([type="hidden"])`,
+	)
+	target?.focus()
+}
+
+function focusOnOpen(event: Event) {
+	event.preventDefault()
+	focusField(props.mode === 'edit' ? 'width' : 'name')
+}
+
+async function confirmDiscard() {
+	if (discardOpen.value) {
+		return
+	}
+	discardOpen.value = true
+	const discard = await overlay
+		.create(ConfirmDialog, {
+			props: {
+				get title() {
+					return t('Discard changes?')
+				},
+				get description() {
+					return discardDescription.value
+				},
+				get confirmLabel() {
+					return t('Discard changes')
+				},
+				get cancelLabel() {
+					return t('Keep editing')
+				},
+				get pendingLabel() {
+					return t('Discard changes')
+				},
+				tone: 'danger',
+				action: async () => undefined,
+			},
+		})
+		.open()
+	discardOpen.value = false
+	if (discard) {
+		emit('close')
+	}
+}
+
+function requestClose() {
+	if (saving.value) {
+		return
+	}
+	if (!form.dirty.value) {
+		emit('close')
+		return
+	}
+	confirmDiscard()
+}
+
+function onOpenChange(isOpen: boolean) {
+	if (!isOpen) {
+		requestClose()
+	}
+}
+
+function showInvalidFromServer(body: string | undefined): FieldName | null {
+	const text = body ?? ''
+	if (text.includes('lowercase letters')) {
+		form.showRemote('name', t('Use lowercase letters, numbers and dashes, 2 to 32 characters.'))
+		return 'name'
+	}
+	if (text.includes('Width and height')) {
+		form.showRemote('width', t('Set a width, a height, or both.'))
+		return 'width'
+	}
+	if (text.includes('Quality')) {
+		form.showRemote('quality', t('Enter a value from 1 to 100.'))
+		return 'quality'
+	}
+	saveFailed.value = true
+	return null
+}
+
+function handleFailure(error: unknown): FieldName | null {
+	if (!(error instanceof ApiError)) {
+		saveFailed.value = true
+		return null
+	}
+	if (isStatus(error, CONFLICT)) {
+		form.showRemote(
+			'name',
+			t('A variant named “{0}” already exists. Choose another name.', [form.values.name]),
+		)
+		return 'name'
+	}
+	if (isStatus(error, UNPROCESSABLE)) {
+		return showInvalidFromServer(error.body)
+	}
+	if (TOAST_STATUSES.includes(error.status)) {
+		announceFailure(error)
+		return null
+	}
+	if (error.status !== 401) {
+		saveFailed.value = true
+	}
+	return null
+}
+
+async function persist() {
+	if (props.mode === 'edit' && props.variant) {
+		const saved = await store.save(props.variant.name, toDefinition(form.values))
+		emit('saved', { mode: 'edit', name: saved.name, purgedFiles: saved.purged_files ?? 0 })
+		return
+	}
+	const created = await store.create(toNewVariant(form.values))
+	emit('saved', { mode: 'create', name: created.name, purgedFiles: 0 })
+}
+
+async function submit() {
+	if (saving.value) {
+		return
+	}
+	saveFailed.value = false
+	const invalid = form.validateAll()
+	if (invalid) {
+		focusField(invalid)
+		return
+	}
+	saving.value = true
+	let toFocus: FieldName | null = null
+	try {
+		await persist()
+	} catch (error) {
+		toFocus = handleFailure(error)
+	} finally {
+		saving.value = false
+	}
+	if (toFocus) {
+		await nextTick()
+		focusField(toFocus)
+	}
+}
+</script>
+
+<template>
+	<USlideover
+		:open="true"
+		side="right"
+		:title="title"
+		:description="t('Define a named size and format for generated images.')"
+		:close="
+			isDesktop
+				? {
+						icon: 'i-lucide-x',
+						color: 'neutral',
+						variant: 'ghost',
+						'aria-label': t('Close'),
+						class: 'size-7 justify-center text-muted',
+					}
+				: false
+		"
+		:content="{ onOpenAutoFocus: focusOnOpen }"
+		:ui="{
+			content: 'w-full max-w-none sm:max-w-240',
+			header: 'h-14 min-h-14 gap-3 px-5 py-0 max-sm:gap-1 max-sm:px-1.5',
+			wrapper: 'min-w-0 flex-1',
+			title: 'truncate text-lg font-semibold',
+			description: 'sr-only',
+			body: 'min-h-0 p-0 sm:overflow-hidden sm:p-0',
+			footer: 'h-18 gap-2 px-4 py-0 sm:h-16 sm:gap-3 sm:px-5',
+		}"
+		@update:open="onOpenChange"
+	>
+		<template #actions>
+			<UButton
+				v-if="!isDesktop"
+				icon="i-lucide-arrow-left"
+				color="neutral"
+				variant="ghost"
+				:aria-label="t('Back')"
+				class="order-first size-11 shrink-0 justify-center"
+				:ui="{ leadingIcon: 'size-5' }"
+				@click="requestClose"
+			/>
+		</template>
+
+		<template #body>
+			<UForm
+				:state="form.values"
+				:validate-on="[]"
+				class="flex flex-col gap-6 p-4 max-sm:pb-25 sm:grid sm:h-full sm:grid-cols-[440px_minmax(0,1fr)] sm:gap-0 sm:p-0"
+				@submit="submit"
+			>
+				<div class="min-w-0 sm:overflow-y-auto sm:p-5">
+					<VariantFormFields
+						v-model:values="form.values"
+						:errors="form.errors.value"
+						:mode="mode"
+						:disabled="saving"
+						:dimension-help-hidden="form.dimensionHelpHidden.value"
+						:generated-files="variant?.generated_files ?? 0"
+						:save-failed="saveFailed"
+						@blur="form.onBlur"
+						@retry="submit"
+					/>
+				</div>
+				<div
+					class="min-w-0 border-t border-default pt-4 sm:overflow-y-auto sm:border-t-0 sm:border-l sm:bg-muted sm:p-5"
+				>
+					<VariantPreview :values="form.values" :disabled="saving" />
+				</div>
+			</UForm>
+		</template>
+
+		<template #footer>
+			<div class="flex w-full items-center gap-2 sm:gap-3">
+				<div v-if="isDesktop" class="flex flex-1 items-center gap-1.5 text-toned">
+					<template v-if="form.dirty.value">
+						<UIcon name="i-lucide-circle-dot" class="size-3.5" />
+						{{ t('Unsaved changes') }}
+					</template>
+				</div>
+				<UButton
+					color="neutral"
+					variant="outline"
+					:disabled="saving"
+					class="h-11 flex-1 justify-center border border-accented bg-default px-3 text-sm text-highlighted ring-0 sm:h-8 sm:flex-none"
+					@click="requestClose"
+				>
+					{{ t('Cancel') }}
+				</UButton>
+				<UButton
+					:loading="saving"
+					:disabled="!form.dirty.value || saving"
+					class="h-11 flex-1 justify-center px-4 text-sm sm:h-8 sm:flex-none"
+					@click="submit"
+				>
+					{{ primaryLabel }}
+				</UButton>
+			</div>
+		</template>
+	</USlideover>
+</template>
diff --git a/web/src/components/variants/VariantPreview.vue b/web/src/components/variants/VariantPreview.vue
new file mode 100644
index 0000000..7c26be0
--- /dev/null
+++ b/web/src/components/variants/VariantPreview.vue
@@ -0,0 +1,111 @@
+<script setup lang="ts">
+import { t } from '@/i18n'
+
+import { computed, ref } from 'vue'
+import ImageCompare from '@/components/variants/ImageCompare.vue'
+import { useCopyToClipboard } from '@/composables/useCopyToClipboard'
+import { SAMPLE_SOURCE, estimateLabel, estimateVariant } from '@/lib/variants/variantEstimate'
+import { parseDimension, sliderValue, type VariantFormValues } from '@/lib/variants/variantForm'
+import { formatVariantSize } from '@/lib/variants/variantFormat'
+
+const URL_PREFIX = '/static/uploadedImages/'
+const NAME_PLACEHOLDER = '<name>'
+
+const props = defineProps<{
+	values: VariantFormValues
+	disabled: boolean
+}>()
+
+const position = ref(50)
+const { copied, copy } = useCopyToClipboard()
+
+const dimensionsAreValid = computed(
+	() =>
+		(props.values.width.trim() === '' || parseDimension(props.values.width) !== null) &&
+		(props.values.height.trim() === '' || parseDimension(props.values.height) !== null),
+)
+
+const estimate = computed(() =>
+	dimensionsAreValid.value
+		? estimateVariant({
+				width: parseDimension(props.values.width),
+				height: parseDimension(props.values.height),
+				fit: props.values.fit,
+				format: props.values.format,
+				quality: sliderValue(props.values.quality),
+			})
+		: null,
+)
+
+const shownName = computed(() => props.values.name || t('name'))
+const outputLine = computed(() =>
+	estimate.value ? estimateLabel(estimate.value) : t('No output yet'),
+)
+const originalLine = computed(
+	() =>
+		`${SAMPLE_SOURCE.width} × ${SAMPLE_SOURCE.height} · ${formatVariantSize(SAMPLE_SOURCE.bytes)}`,
+)
+const hasName = computed(() => props.values.name !== '')
+const url = computed(
+	() => `${URL_PREFIX}${SAMPLE_SOURCE.filename}?v=${props.values.name || NAME_PLACEHOLDER}`,
+)
+
+async function onCopy() {
+	try {
+		await copy(url.value)
+	} catch {
+		return
+	}
+}
+</script>
+
+<template>
+	<div class="flex min-w-0 flex-col gap-3">
+		<div class="flex items-baseline gap-2">
+			<h3 class="flex-1 font-semibold text-highlighted">{{ t('Preview') }}</h3>
+			<span class="text-xs/5 text-muted">{{
+				t('Sample: {0}', [SAMPLE_SOURCE.filename])
+			}}</span>
+		</div>
+		<ImageCompare v-model="position" :name="values.name" :comparable="estimate !== null" />
+		<div class="grid grid-cols-2 gap-3">
+			<div class="flex flex-col">
+				<span class="font-medium text-highlighted">{{ t('Original') }}</span>
+				<span class="text-xs/5 text-muted">{{ originalLine }}</span>
+			</div>
+			<div class="flex flex-col">
+				<span class="font-mono font-medium text-highlighted">{{ shownName }}</span>
+				<span class="text-xs/5 text-muted">{{ outputLine }}</span>
+			</div>
+		</div>
+		<p class="text-xs/5 text-muted">
+			{{
+				t(
+					'Drag the divider, or focus it and use the arrow keys. The estimate comes from a sample; output is never larger than the source.',
+				)
+			}}
+		</p>
+		<div class="flex flex-col gap-1.5">
+			<span class="font-medium text-highlighted">{{ t('URL') }}</span>
+			<div class="flex gap-2">
+				<div
+					data-testid="variant-url"
+					class="flex min-h-11 min-w-0 flex-1 items-center truncate border border-default bg-elevated px-3 font-mono text-xs sm:min-h-8"
+					:class="hasName ? 'text-highlighted' : 'text-muted'"
+				>
+					{{ url }}
+				</div>
+				<UButton
+					color="neutral"
+					variant="outline"
+					:icon="copied ? 'i-lucide-check' : 'i-lucide-copy'"
+					:disabled="!hasName || disabled"
+					class="h-11 shrink-0 gap-1.5 border border-accented bg-default px-3 text-sm text-highlighted ring-0 sm:h-8"
+					@click="onCopy"
+				>
+					{{ copied ? t('Copied') : t('Copy') }}
+				</UButton>
+			</div>
+		</div>
+	</div>
+</template>
diff --git a/web/src/components/variants/VariantRowMenu.vue b/web/src/components/variants/VariantRowMenu.vue
new file mode 100644
index 0000000..8323e82
--- /dev/null
+++ b/web/src/components/variants/VariantRowMenu.vue
@@ -0,0 +1,64 @@
+<script setup lang="ts">
+import { t } from '@/i18n'
+
+import { computed } from 'vue'
+
+const props = defineProps<{
+	name: string
+	disabled: boolean
+}>()
+
+const emit = defineEmits<{ edit: []; purge: []; delete: [] }>()
+
+const label = computed(() => t('Actions for {0}', [props.name]))
+
+const items = computed(() => [
+	[
+		{
+			get label() {
+				return t('Edit')
+			},
+			icon: 'i-lucide-pencil',
+			onSelect: () => emit('edit'),
+		},
+		{
+			get label() {
+				return t('Purge cache')
+			},
+			icon: 'i-lucide-eraser',
+			onSelect: () => emit('purge'),
+		},
+		{
+			get label() {
+				return t('Delete')
+			},
+			icon: 'i-lucide-trash-2',
+			color: 'error' as const,
+			onSelect: () => emit('delete'),
+		},
+	],
+])
+</script>
+
+<template>
+	<UTooltip :text="label">
+		<UDropdownMenu
+			:items="items"
+			:content="{ align: 'end' }"
+			:ui="{
+				content: 'w-44',
+				item: 'h-8 gap-2 px-2 text-sm max-sm:h-11',
+				itemLeadingIcon: 'size-3.5',
+			}"
+		>
+			<UButton
+				icon="i-lucide-ellipsis"
+				color="neutral"
+				variant="ghost"
+				:aria-label="label"
+				:disabled="disabled"
+				class="size-7 shrink-0 justify-center text-highlighted data-[state=open]:outline-2 data-[state=open]:outline-offset-2 data-[state=open]:outline-primary max-sm:size-11"
+			/>
+		</UDropdownMenu>
+	</UTooltip>
+</template>
diff --git a/web/src/components/variants/VariantStatusSwitch.vue b/web/src/components/variants/VariantStatusSwitch.vue
new file mode 100644
index 0000000..7341ff3
--- /dev/null
+++ b/web/src/components/variants/VariantStatusSwitch.vue
@@ -0,0 +1,55 @@
+<script setup lang="ts">
+import { t } from '@/i18n'
+
+import { computed } from 'vue'
+
+const props = defineProps<{
+	name: string
+	enabled: boolean
+	purging: boolean
+	locked: boolean
+}>()
+
+const emit = defineEmits<{ toggle: [value: boolean] }>()
+
+const word = computed(() => {
+	if (props.purging) {
+		return t('Purging…')
+	}
+	return props.enabled ? t('Enabled') : t('Disabled')
+})
+
+const icon = computed(() => {
+	if (props.purging) {
+		return 'i-lucide-loader-circle'
+	}
+	return props.enabled ? 'i-lucide-circle-check' : 'i-lucide-circle-off'
+})
+
+const tone = computed(() => {
+	if (props.purging) {
+		return 'text-info'
+	}
+	return props.enabled ? 'text-highlighted' : 'text-muted'
+})
+</script>
+
+<template>
+	<div class="flex items-center gap-2 whitespace-nowrap" :class="tone">
+		<USwitch
+			:model-value="enabled"
+			:disabled="locked"
+			:aria-label="t('Enable variant {0}', [name])"
+			:ui="{
+				container: 'h-4.5',
+				base: 'relative h-4.5 w-8 before:absolute before:-inset-3.5 data-[disabled]:opacity-40 sm:before:hidden',
+				thumb: 'size-3.5 data-[state=checked]:translate-x-3.5',
+			}"
+			@update:model-value="emit('toggle', $event)"
+		/>
+		<span class="flex items-center gap-1">
+			<UIcon :name="icon" class="size-3.5 shrink-0" :class="{ 'animate-spin': purging }" />
+			{{ word }}
+		</span>
+	</div>
+</template>
diff --git a/web/src/components/variants/VariantsEmpty.vue b/web/src/components/variants/VariantsEmpty.vue
new file mode 100644
index 0000000..5ffe31b
--- /dev/null
+++ b/web/src/components/variants/VariantsEmpty.vue
@@ -0,0 +1,61 @@
+<script setup lang="ts">
+import { t } from '@/i18n'
+
+import { VARIANT_TEMPLATES } from '@/lib/variants/variantForm'
+import { fitLabel, formatDimensions, formatLabel } from '@/lib/variants/variantFormat'
+
+const emit = defineEmits<{ add: []; template: [name: string] }>()
+
+function description(template: (typeof VARIANT_TEMPLATES)[number]) {
+	return [
+		formatDimensions(template.width, template.height),
+		fitLabel('cover'),
+		formatLabel('webp'),
+	].join(' · ')
+}
+</script>
+
+<template>
+	<UEmpty
+		variant="naked"
+		icon="i-lucide-layers"
+		:title="t('No variants yet')"
+		:description="
+			t(
+				'A variant is a named size that an image can be requested in, like ?v=thumb. Start with one of these.',
+			)
+		"
+		:ui="{
+			root: 'gap-3 border border-default bg-default px-6 py-10',
+			header: 'max-w-none gap-3',
+			body: 'w-full max-w-none items-center gap-3',
+			avatar: 'mb-0 size-11 rounded-none bg-elevated text-toned',
+			title: 'text-md font-semibold',
+			description: 'max-w-95 text-pretty text-muted',
+			actions: 'w-full flex-col items-center justify-center gap-3',
+		}"
+	>
+		<template #actions>
+			<div class="flex w-full max-w-130 flex-col gap-3 sm:flex-row">
+				<UButton
+					v-for="template in VARIANT_TEMPLATES"
+					:key="template.name"
+					color="neutral"
+					variant="outline"
+					class="min-h-16 flex-1 flex-col items-start justify-start gap-0.5 border border-accented bg-default p-3 text-left ring-0 sm:min-h-0"
+					@click="emit('template', template.name)"
+				>
+					<span class="font-mono font-medium text-highlighted">{{ template.name }}</span>
+					<span class="text-xs/5 text-muted">{{ description(template) }}</span>
+					<span class="mt-2 flex items-center gap-1 font-medium text-highlighted">
+						<UIcon name="i-lucide-plus" class="size-3.5" />
+						{{ t('Use template') }}
+					</span>
+				</UButton>
+			</div>
+			<UButton icon="i-lucide-plus" class="h-8 px-4" @click="emit('add')">
+				{{ t('Add variant') }}
+			</UButton>
+		</template>
+	</UEmpty>
+</template>
diff --git a/web/src/components/variants/VariantsForbidden.vue b/web/src/components/variants/VariantsForbidden.vue
new file mode 100644
index 0000000..ffb8dbc
--- /dev/null
+++ b/web/src/components/variants/VariantsForbidden.vue
@@ -0,0 +1,34 @@
+<script setup lang="ts">
+import { t } from '@/i18n'
+
+const emit = defineEmits<{ home: [] }>()
+</script>
+
+<template>
+	<UEmpty
+		variant="naked"
+		icon="i-lucide-lock"
+		:title="t('You don\'t have access')"
+		:description="
+			t('Only admins can manage image variants. Ask an admin if you need one changed.')
+		"
+		:ui="{
+			root: 'gap-3 border border-default bg-default px-6 py-18',
+			avatar: 'mb-0 size-11 rounded-none bg-elevated text-toned',
+			title: 'text-md font-semibold',
+			description: 'max-w-95 text-pretty text-muted',
+		}"
+	>
+		<template #actions>
+			<UButton
+				color="neutral"
+				variant="outline"
+				icon="i-lucide-arrow-left"
+				class="h-11 gap-1.5 border border-accented bg-default px-3 text-sm text-highlighted ring-0 sm:h-8"
+				@click="emit('home')"
+			>
+				{{ t('Back to Home') }}
+			</UButton>
+		</template>
+	</UEmpty>
+</template>
diff --git a/web/src/components/variants/VariantsSkeleton.vue b/web/src/components/variants/VariantsSkeleton.vue
new file mode 100644
index 0000000..5b66eef
--- /dev/null
+++ b/web/src/components/variants/VariantsSkeleton.vue
@@ -0,0 +1,41 @@
+<script setup lang="ts">
+import { t } from '@/i18n'
+
+defineProps<{ desktop: boolean }>()
+
+const DESKTOP_ROWS = 5
+const MOBILE_CARDS = 4
+const ROW_BARS = ['w-30', 'w-22.5', 'w-15', 'w-15', 'w-20', 'w-40']
+const BAR = 'rounded-none bg-accented'
+</script>
+
+<template>
+	<section :aria-label="t('Loading variants')" aria-busy="true">
+		<div v-if="desktop" class="border border-default bg-default">
+			<div class="h-9 bg-elevated" />
+			<div
+				v-for="row in DESKTOP_ROWS"
+				:key="row"
+				class="flex h-12 items-center gap-8 border-t border-muted px-4"
+			>
+				<USkeleton
+					v-for="(width, index) in ROW_BARS"
+					:key="index"
+					class="h-3.25"
+					:class="[BAR, width]"
+				/>
+			</div>
+		</div>
+		<div v-else class="flex flex-col gap-2">
+			<div
+				v-for="card in MOBILE_CARDS"
+				:key="card"
+				class="flex flex-col gap-2.5 border border-default bg-default p-3"
+			>
+				<USkeleton class="h-3.25 w-[40%]" :class="BAR" />
+				<USkeleton class="h-2.75 w-[70%]" :class="BAR" />
+				<USkeleton class="h-2.75 w-[55%]" :class="BAR" />
+			</div>
+		</div>
+	</section>
+</template>
diff --git a/web/src/components/variants/VariantsTable.vue b/web/src/components/variants/VariantsTable.vue
new file mode 100644
index 0000000..bfb5979
--- /dev/null
+++ b/web/src/components/variants/VariantsTable.vue
@@ -0,0 +1,175 @@
+<script setup lang="ts">
+import { formatNumber, t } from '@/i18n'
+
+import { computed } from 'vue'
+import VariantRowMenu from '@/components/variants/VariantRowMenu.vue'
+import VariantStatusSwitch from '@/components/variants/VariantStatusSwitch.vue'
+import type { ImageVariant } from '@/composables/useImageVariants'
+import {
+	fitLabel,
+	formatDimensions,
+	formatLabel,
+	formatVariantSize,
+	qualityCell,
+	variantsSummary,
+} from '@/lib/variants/variantFormat'
+
+const props = defineProps<{
+	items: ImageVariant[]
+	isEnabled: (item: ImageVariant) => boolean
+	isLocked: (name: string) => boolean
+	isPurging: (name: string) => boolean
+}>()
+
+const emit = defineEmits<{
+	toggle: [name: string, value: boolean]
+	edit: [name: string]
+	purge: [name: string]
+	delete: [name: string]
+}>()
+
+function fixed(width: string) {
+	return { meta: { class: { th: width, td: width } } }
+}
+
+const columns = computed(() => [
+	{
+		id: 'name',
+		get header() {
+			return t('Name')
+		},
+	},
+	{
+		id: 'dimensions',
+		get header() {
+			return t('Dimensions')
+		},
+		...fixed('w-26'),
+	},
+	{
+		id: 'fit',
+		get header() {
+			return t('Fit')
+		},
+		...fixed('w-19'),
+	},
+	{
+		id: 'format',
+		get header() {
+			return t('Format')
+		},
+		...fixed('w-18'),
+	},
+	{
+		id: 'quality',
+		get header() {
+			return t('Quality')
+		},
+		...fixed('w-17'),
+	},
+	{
+		id: 'generated',
+		get header() {
+			return t('Generated')
+		},
+		...fixed('w-23'),
+	},
+	{
+		id: 'cache_size',
+		get header() {
+			return t('Cache size')
+		},
+		...fixed('w-23'),
+	},
+	{
+		id: 'status',
+		get header() {
+			return t('Status')
+		},
+		...fixed('w-33'),
+	},
+	{ id: 'actions', header: '', ...fixed('w-11') },
+])
+
+const meta = {
+	class: {
+		tr: (row: { original: ImageVariant }) => {
+			const item = row.original
+			const tone = props.isEnabled(item) ? 'text-default' : 'text-muted'
+			return props.isPurging(item.name) ? `bg-elevated ${tone}` : `bg-default ${tone}`
+		},
+	},
+}
+
+const summary = computed(() => variantsSummary(props.items))
+
+function variant(row: { original: ImageVariant }) {
+	return row.original
+}
+
+function nameTone(row: { original: ImageVariant }) {
+	return props.isEnabled(variant(row)) ? 'text-highlighted' : 'text-muted'
+}
+</script>
+
+<template>
+	<div class="border border-default bg-default">
+		<UTable
+			:data="items"
+			:columns="columns"
+			:meta="meta"
+			:ui="{
+				base: 'w-full table-fixed',
+				thead: 'bg-elevated [&>tr]:border-t-0',
+				separator: 'hidden',
+				th: 'h-9 px-0 py-0 first:pl-4 last:pr-2',
+				td: 'h-12 px-0 py-0 first:pl-4 last:pr-2',
+				tbody: 'divide-y-0',
+				tr: 'border-t border-muted',
+			}"
+		>
+			<template #name-cell="{ row }">
+				<span class="block truncate font-mono text-sm font-medium" :class="nameTone(row)">{{
+					variant(row).name
+				}}</span>
+			</template>
+			<template #dimensions-cell="{ row }">
+				<span class="font-mono text-xs">{{
+					formatDimensions(variant(row).width, variant(row).height)
+				}}</span>
+			</template>
+			<template #fit-cell="{ row }">{{ fitLabel(variant(row).fit) }}</template>
+			<template #format-cell="{ row }">{{ formatLabel(variant(row).format) }}</template>
+			<template #quality-cell="{ row }">{{ qualityCell(variant(row)) }}</template>
+			<template #generated-cell="{ row }">{{
+				formatNumber(variant(row).generated_files)
+			}}</template>
+			<template #cache_size-cell="{ row }">{{
+				formatVariantSize(variant(row).cache_size)
+			}}</template>
+			<template #status-cell="{ row }">
+				<VariantStatusSwitch
+					:name="variant(row).name"
+					:enabled="isEnabled(variant(row))"
+					:purging="isPurging(variant(row).name)"
+					:locked="isLocked(variant(row).name)"
+					@toggle="emit('toggle', variant(row).name, $event)"
+				/>
+			</template>
+			<template #actions-cell="{ row }">
+				<span class="flex justify-end">
+					<VariantRowMenu
+						:name="variant(row).name"
+						:disabled="isPurging(variant(row).name)"
+						@edit="emit('edit', variant(row).name)"
+						@purge="emit('purge', variant(row).name)"
+						@delete="emit('delete', variant(row).name)"
+					/>
+				</span>
+			</template>
+		</UTable>
+		<div data-testid="variants-summary" class="border-t border-default px-4 py-2.5 text-toned">
+			{{ summary }}
+		</div>
+	</div>
+</template>
diff --git a/web/src/components/variants/VariantsTabs.vue b/web/src/components/variants/VariantsTabs.vue
new file mode 100644
index 0000000..0948f68
--- /dev/null
+++ b/web/src/components/variants/VariantsTabs.vue
@@ -0,0 +1,39 @@
+<script setup lang="ts">
+import { t } from '@/i18n'
+
+const TAB = 'h-9 gap-1.5 rounded-none border-b-2 px-0 py-0 text-sm hover:bg-transparent max-sm:h-11'
+const ACTIVE = 'border-primary font-medium text-highlighted'
+const INACTIVE = 'border-transparent font-normal text-toned aria-disabled:opacity-100'
+</script>
+
+<template>
+	<div
+		role="tablist"
+		:aria-label="t('Image variants')"
+		class="flex gap-5 border-b border-default"
+	>
+		<UButton
+			role="tab"
+			aria-selected="true"
+			icon="i-lucide-layers"
+			color="neutral"
+			variant="ghost"
+			:class="[TAB, ACTIVE, '-mb-px']"
+			:ui="{ leadingIcon: 'size-3.5' }"
+		>
+			{{ t('Variants') }}
+		</UButton>
+		<UButton
+			role="tab"
+			aria-selected="false"
+			aria-disabled="true"
+			icon="i-lucide-database"
+			color="neutral"
+			variant="ghost"
+			:class="[TAB, INACTIVE, '-mb-px']"
+			:ui="{ leadingIcon: 'size-3.5' }"
+		>
+			{{ t('Cache') }}
+		</UButton>
+	</div>
+</template>
diff --git a/web/src/composables/useImageVariants.ts b/web/src/composables/useImageVariants.ts
new file mode 100644
index 0000000..4ff9244
--- /dev/null
+++ b/web/src/composables/useImageVariants.ts
@@ -0,0 +1,99 @@
+import { useApi } from '@/composables/useApi'
+
+export type VariantFit = 'cover' | 'contain' | 'inside'
+export type VariantFormat = 'original' | 'jpeg' | 'png' | 'webp'
+
+export interface ImageVariant {
+	name: string
+	width: number | null
+	height: number | null
+	fit: VariantFit
+	format: VariantFormat
+	quality: number | null
+	generate_on_upload: boolean
+	enabled: boolean
+	generated_files: number
+	cache_size: number
+	created_at?: string
+	updated_at?: string
+}
+
+export interface VariantDefinition {
+	width: number | null
+	height: number | null
+	fit: VariantFit
+	format: VariantFormat
+	quality?: number
+	generate_on_upload: boolean
+	enabled: boolean
+}
+
+export interface NewVariantRequest extends VariantDefinition {
+	name: string
+}
+
+export interface SavedVariant extends ImageVariant {
+	purged_files?: number
+}
+
+export interface PurgeResult {
+	purged_files: number
+	purged_bytes: number
+}
+
+const JSON_HEADERS = { 'Content-Type': 'application/json' }
+const BASE_PATH = '/v1/image-variants'
+
+function variantPath(name: string) {
+	return `${BASE_PATH}/${encodeURIComponent(name)}`
+}
+
+export function useImageVariants() {
+	const { request } = useApi()
+
+	async function listVariants(): Promise<ImageVariant[]> {
+		const body = await request<{ items: ImageVariant[] }>(BASE_PATH)
+		return body.items
+	}
+
+	function createVariant(input: NewVariantRequest): Promise<ImageVariant> {
+		return request<ImageVariant>(BASE_PATH, {
+			method: 'POST',
+			headers: JSON_HEADERS,
+			body: JSON.stringify(input),
+		})
+	}
+
+	function replaceVariant(name: string, input: VariantDefinition): Promise<SavedVariant> {
+		return request<SavedVariant>(variantPath(name), {
+			method: 'PUT',
+			headers: JSON_HEADERS,
+			body: JSON.stringify(input),
+		})
+	}
+
+	function setVariantEnabled(name: string, enabled: boolean): Promise<ImageVariant> {
+		return request<ImageVariant>(variantPath(name), {
+			method: 'PATCH',
+			headers: JSON_HEADERS,
+			body: JSON.stringify({ enabled }),
+		})
+	}
+
+	function deleteVariant(name: string): Promise<void> {
+		return request<void>(variantPath(name), { method: 'DELETE' })
+	}
+
+	function purgeVariant(name: string): Promise<PurgeResult> {
+		return request<PurgeResult>(`${variantPath(name)}/purge`, { method: 'POST' })
+	}
+
+	return {
+		listVariants,
+		createVariant,
+		replaceVariant,
+		setVariantEnabled,
+		deleteVariant,
+		purgeVariant,
+	}
+}
diff --git a/web/src/composables/useVariantForm.ts b/web/src/composables/useVariantForm.ts
new file mode 100644
index 0000000..647d8d4
--- /dev/null
+++ b/web/src/composables/useVariantForm.ts
@@ -0,0 +1,93 @@
+import { t } from '@/i18n'
+
+import { computed, reactive, ref, watch } from 'vue'
+import {
+	FIELD_ORDER,
+	blankValues,
+	hasChanged,
+	lacksDimension,
+	validateField,
+	type FieldErrors,
+	type FieldName,
+	type VariantFormValues,
+} from '@/lib/variants/variantForm'
+
+export type FormMode = 'create' | 'edit'
+
+type RemoteField = 'name' | 'width' | 'quality'
+
+export function useVariantForm(mode: FormMode, initial: VariantFormValues) {
+	const values = reactive<VariantFormValues>({ ...initial })
+	const baseline: VariantFormValues = mode === 'edit' ? { ...initial } : blankValues()
+	const shown = reactive<Record<FieldName, boolean>>({
+		name: false,
+		width: false,
+		height: false,
+		quality: false,
+	})
+	const dimensionShown = ref(false)
+	const remote = reactive<Partial<Record<RemoteField, string>>>({})
+
+	const dirty = computed(() => hasChanged(values, baseline))
+
+	const dimensionError = computed(() =>
+		dimensionShown.value && lacksDimension(values)
+			? t('Set a width, a height, or both.')
+			: undefined,
+	)
+
+	const errors = computed<FieldErrors>(() => ({
+		name: remote.name ?? (shown.name ? validateField('name', values) : undefined),
+		width:
+			remote.width ??
+			(shown.width ? validateField('width', values) : undefined) ??
+			dimensionError.value,
+		height: shown.height ? validateField('height', values) : undefined,
+		quality: remote.quality ?? (shown.quality ? validateField('quality', values) : undefined),
+		dimension: dimensionError.value,
+	}))
+
+	const dimensionHelpHidden = computed(
+		() =>
+			Boolean(errors.value.width) ||
+			Boolean(errors.value.height) ||
+			Boolean(dimensionError.value),
+	)
+
+	function onBlur(field: FieldName) {
+		if (values[field] !== baseline[field]) {
+			shown[field] = true
+		}
+	}
+
+	function validateAll(): FieldName | null {
+		for (const field of FIELD_ORDER) {
+			shown[field] = true
+		}
+		dimensionShown.value = true
+		const invalid = FIELD_ORDER.find((field) => validateField(field, values) !== undefined)
+		if (invalid) {
+			return invalid
+		}
+		return lacksDimension(values) ? 'width' : null
+	}
+
+	function showRemote(field: RemoteField, message: string) {
+		remote[field] = message
+	}
+
+	watch(
+		() => values.name,
+		() => delete remote.name,
+	)
+	watch(
+		() => [values.width, values.height],
+		() => delete remote.width,
+	)
+	watch(
+		() => values.quality,
+		() => delete remote.quality,
+	)
+
+	return { values, dirty, errors, dimensionHelpHidden, onBlur, validateAll, showRemote }
+}
diff --git a/web/src/composables/useVariantToasts.ts b/web/src/composables/useVariantToasts.ts
new file mode 100644
index 0000000..a1d0292
--- /dev/null
+++ b/web/src/composables/useVariantToasts.ts
@@ -0,0 +1,31 @@
+import { useLocalizedToast } from '@/i18n/presentation'
+import { toastCopyFor } from '@/lib/variants/variantErrors'
+
+export function useVariantToasts() {
+	const toast = useLocalizedToast()
+
+	function announceFailure(error: unknown) {
+		toast.add(() => ({
+			color: 'error' as const,
+			icon: 'i-lucide-circle-x',
+			get title() {
+				return toastCopyFor(error).title
+			},
+			get description() {
+				return toastCopyFor(error).description
+			},
+		}))
+	}
+
+	function announceSuccess(message: () => string) {
+		toast.add(() => ({
+			color: 'success' as const,
+			icon: 'i-lucide-circle-check',
+			get title() {
+				return message()
+			},
+		}))
+	}
+
+	return { announceFailure, announceSuccess }
+}
diff --git a/web/src/i18n/messages.ts b/web/src/i18n/messages.ts
index d7a2e95..e65062c 100644
--- a/web/src/i18n/messages.ts
+++ b/web/src/i18n/messages.ts
@@ -1237,6 +1237,130 @@ export const messages = {
 	'Apply {0} GB': 'Appliquer {0} Go',
 	"Couldn't save the retention period": 'Impossible d’enregistrer la durée de conservation',
 	'Your previous setting is still in place.': 'Votre réglage précédent est conservé.',
+	'Image variants': 'Variantes d’image',
+	Variants: 'Variantes',
+	Cache: 'Cache',
+	'Add variant': 'Ajouter une variante',
+	'Named sizes and formats generated from your original images. Originals are never changed.':
+		'Tailles et formats nommés générés à partir de vos images originales. Les originaux ne sont jamais modifiés.',
+	'Loading variants': 'Chargement des variantes',
+	Generated: 'Générés',
+	'Cache size': 'Taille du cache',
+	Fit: 'Ajustement',
+	Format: 'Format',
+	Quality: 'Qualité',
+	Height: 'Hauteur',
+	Enabled: 'Activée',
+	Disabled: 'Désactivée',
+	cover: 'remplir',
+	contain: 'contenir',
+	inside: 'à l’intérieur',
+	Cover: 'Remplir',
+	Contain: 'Contenir',
+	Inside: 'À l’intérieur',
+	auto: 'auto',
+	name: 'nom',
+	'q{0}': 'q{0}',
+	'1 variant': '1 variante',
+	'{0} variants': '{0} variantes',
+	'1 generated file': '1 fichier généré',
+	'{0} generated files': '{0} fichiers générés',
+	'{0} generated · {1}': '{0} générés · {1}',
+	'Enable variant {0}': 'Activer la variante {0}',
+	'Purge cache': 'Purger le cache',
+	'Use template': 'Utiliser le modèle',
+	'No variants yet': 'Aucune variante pour l’instant',
+	'A variant is a named size that an image can be requested in, like ?v=thumb. Start with one of these.':
+		'Une variante est une taille nommée dans laquelle une image peut être demandée, comme ?v=thumb. Commencez par l’une de celles-ci.',
+	"You don't have access": 'Vous n’avez pas accès',
+	'Only admins can manage image variants. Ask an admin if you need one changed.':
+		'Seuls les administrateurs peuvent gérer les variantes d’image. Demandez à un administrateur si vous en avez besoin d’une modifiée.',
+	'Only admins can manage image variants.':
+		'Seuls les administrateurs peuvent gérer les variantes d’image.',
+	'Back to Home': 'Retour à l’accueil',
+	"Couldn't load variants": 'Impossible de charger les variantes',
+	"Couldn't save the variant": 'Impossible d’enregistrer la variante',
+	'Check the request': 'Vérifiez la requête',
+	"A value in the request isn't valid. Reload the page and try again.":
+		'Une valeur de la requête n’est pas valide. Rechargez la page et réessayez.',
+	'This variant or image no longer exists. Refresh the page.':
+		'Cette variante ou cette image n’existe plus. Actualisez la page.',
+	"The server couldn't finish. Try again. If it keeps happening, check the server log.":
+		'Le serveur n’a pas pu terminer. Réessayez. Si le problème persiste, consultez le journal du serveur.',
+	'Purge cache for “{0}”?': 'Purger le cache de « {0} » ?',
+	'This removes {0} ({1}). Files are generated again on the next request.':
+		'Cela supprime {0} ({1}). Les fichiers sont générés à nouveau à la prochaine requête.',
+	'Purge 1 file': 'Purger 1 fichier',
+	'Purge {0} files': 'Purger {0} fichiers',
+	'Purged 1 file from “{0}”': '1 fichier purgé de « {0} »',
+	'Purged {0} files from “{1}”': '{0} fichiers purgés de « {1} »',
+	'Delete variant “{0}”?': 'Supprimer la variante « {0} » ?',
+	"This removes the variant and its {0} ({1}). Articles that use ?v={2} will start returning 400. This can't be undone.":
+		'Cela supprime la variante et ses fichiers générés ({0}, {1}). Les articles qui utilisent ?v={2} renverront une erreur 400. Cette action est irréversible.',
+	'Delete variant': 'Supprimer la variante',
+	'Variant “{0}” deleted': 'Variante « {0} » supprimée',
+	'Variant “{0}” added': 'Variante « {0} » ajoutée',
+	'Variant “{0}” saved.': 'Variante « {0} » enregistrée.',
+	'Variant “{0}” saved. 1 file purged.': 'Variante « {0} » enregistrée. 1 fichier purgé.',
+	'Variant “{0}” saved. {1} files purged.': 'Variante « {0} » enregistrée. {1} fichiers purgés.',
+	'Unknown or disabled variant': 'Variante inconnue ou désactivée',
+	'Unknown variant': 'Variante inconnue',
+	'width, height, format or quality': 'width, height, format ou quality',
+	'Unsupported parameter': 'Paramètre non pris en charge',
+	'Missing source image': 'Image source introuvable',
+	'How requests are handled': 'Traitement des requêtes',
+	'Body of a 400 response': 'Corps d’une réponse 400',
+	'unsupported_parameter replaces unknown_variant when a raw parameter is sent. There is no arbitrary-size mode.':
+		'unsupported_parameter remplace unknown_variant lorsqu’un paramètre brut est envoyé. Il n’existe pas de mode à taille arbitraire.',
+	'Edit variant: {0}': 'Modifier la variante : {0}',
+	'Save changes': 'Enregistrer les modifications',
+	Back: 'Retour',
+	'Define a named size and format for generated images.':
+		'Définit une taille et un format nommés pour les images générées.',
+	"You have unsaved changes to “{0}”. If you close now, they're lost.":
+		'Vous avez des modifications non enregistrées sur « {0} ». Si vous fermez maintenant, elles seront perdues.',
+	"You have unsaved changes. If you close now, they're lost.":
+		'Vous avez des modifications non enregistrées. Si vous fermez maintenant, elles seront perdues.',
+	'Discard changes?': 'Abandonner les modifications ?',
+	"The name can't be changed.": 'Le nom ne peut pas être modifié.',
+	"Lowercase letters, numbers and dashes. Can't be changed later.":
+		'Lettres minuscules, chiffres et tirets. Ne pourra pas être modifié plus tard.',
+	'e.g. hero': 'p. ex. hero',
+	'Set a width, a height, or both. 1–8000 px. Images are never enlarged.':
+		'Indiquez une largeur, une hauteur, ou les deux. De 1 à 8 000 px. Les images ne sont jamais agrandies.',
+	'Set a width, a height, or both.': 'Indiquez une largeur, une hauteur, ou les deux.',
+	'Enter a value from 1 to 8000.': 'Saisissez une valeur de 1 à 8 000.',
+	'Enter a value from 1 to 100.': 'Saisissez une valeur de 1 à 100.',
+	'Use lowercase letters, numbers and dashes, 2 to 32 characters.':
+		'Utilisez des lettres minuscules, des chiffres et des tirets, de 2 à 32 caractères.',
+	'A variant named “{0}” already exists. Choose another name.':
+		'Une variante nommée « {0} » existe déjà. Choisissez un autre nom.',
+	'Fills the box and crops what overflows.': 'Remplit le cadre et rogne ce qui dépasse.',
+	'Whole image inside the box, padded to the box size.':
+		'Image entière dans le cadre, complétée jusqu’à la taille du cadre.',
+	'Whole image inside the box, no padding.': 'Image entière dans le cadre, sans marge.',
+	'Keeps the format of each source image.': 'Conserve le format de chaque image source.',
+	'1–100. Higher is sharper and larger.':
+		'De 1 à 100. Plus la valeur est haute, plus l’image est nette et lourde.',
+	'Generate on upload': 'Générer à l’import',
+	'Creates this variant when an image is uploaded.':
+		'Crée cette variante lorsqu’une image est importée.',
+	'Disabled variants return 400 on the public site.':
+		'Les variantes désactivées renvoient 400 sur le site public.',
+	'Changing dimensions, fit, format or quality purges 1 generated file; it will be regenerated on next request.':
+		'Modifier les dimensions, l’ajustement, le format ou la qualité purge 1 fichier généré ; il sera régénéré à la prochaine requête.',
+	'Changing dimensions, fit, format or quality purges {0} generated files; they will be regenerated on next request.':
+		'Modifier les dimensions, l’ajustement, le format ou la qualité purge {0} fichiers générés ; ils seront régénérés à la prochaine requête.',
+	'Set a width or height to see a preview.':
+		'Indiquez une largeur ou une hauteur pour voir un aperçu.',
+	'Compare original and {0}': 'Comparer l’original et {0}',
+	'{0}% {1}': '{0} % {1}',
+	'No output yet': 'Pas encore de résultat',
+	'Sample: {0}': 'Exemple : {0}',
+	'{0} · about {1}': '{0} · environ {1}',
+	'Drag the divider, or focus it and use the arrow keys. The estimate comes from a sample; output is never larger than the source.':
+		'Faites glisser le séparateur, ou donnez-lui le focus et utilisez les flèches. L’estimation vient d’un échantillon ; le résultat n’est jamais plus lourd que la source.',
+	URL: 'URL',
 } as const
 
 export type MessageKey = keyof typeof messages
diff --git a/web/src/lib/variants/__tests__/variantEstimate.spec.ts b/web/src/lib/variants/__tests__/variantEstimate.spec.ts
new file mode 100644
index 0000000..3f0f1ca
--- /dev/null
+++ b/web/src/lib/variants/__tests__/variantEstimate.spec.ts
@@ -0,0 +1,93 @@
+import { describe, expect, it } from 'vitest'
+import {
+	SAMPLE_SOURCE,
+	estimateLabel,
+	estimateVariant,
+	formatPixelSize,
+	type EstimateRequest,
+} from '../variantEstimate'
+import { outputSize } from '../variantOutput'
+
+const SAMPLE = { width: 4032, height: 3024 }
+
+function request(overrides: Partial<EstimateRequest>): EstimateRequest {
+	return {
+		width: 1200,
+		height: 630,
+		fit: 'cover',
+		format: 'webp',
+		quality: 82,
+		...overrides,
+	}
+}
+
+function labelOf(overrides: Partial<EstimateRequest>) {
+	return estimateLabel(estimateVariant(request(overrides))!)
+}
+
+describe('Output size, never enlarged', () => {
+	it.each([
+		[1200, 630, 'cover', '1200×630'],
+		[800, null, 'cover', '800×600'],
+		[null, 2400, 'inside', '3200×2400'],
+		[600, 600, 'contain', '600×600'],
+		[1000, 1000, 'inside', '1000×750'],
+		[8000, 8000, 'cover', '4032×3024'],
+	] as const)('width %s height %s fit %s gives %s', (width, height, fit, expected) => {
+		const size = outputSize(SAMPLE, { width, height, fit })
+
+		expect(formatPixelSize(size!)).toBe(expected)
+	})
+
+	it('has no output without a dimension', () => {
+		expect(outputSize(SAMPLE, { width: null, height: null, fit: 'cover' })).toBeNull()
+	})
+
+	it('crops to the box ratio when the box is smaller than the source in one dimension', () => {
+		const size = outputSize(
+			{ width: 300, height: 200 },
+			{ width: 400, height: 150, fit: 'cover' },
+		)
+
+		expect(size).toEqual({ width: 300, height: 113 })
+	})
+
+	it('crops a square box out of the sample', () => {
+		const size = outputSize(SAMPLE, { width: 1000, height: 1000, fit: 'cover' })
+
+		expect(size).toEqual({ width: 1000, height: 1000 })
+	})
+})
+
+describe('Size estimate', () => {
+	it.each([
+		['hero', 1200, 630, 'cover', 'webp', 82, '1200×630 · about 96 KB'],
+		['hero', 1200, 630, 'cover', 'webp', 70, '1200×630 · about 71 KB'],
+		['hero', 1200, 630, 'cover', 'png', 82, '1200×630 · about 310 KB'],
+		['thumb', 400, 300, 'cover', 'webp', 80, '400×300 · about 18 KB'],
+	] as const)(
+		'%s %s×%s %s %s q%s reads %s',
+		(_name, width, height, fit, format, quality, expected) => {
+			expect(labelOf({ width, height, fit, format, quality })).toBe(expected)
+		},
+	)
+
+	it('gives a smaller or equal estimate for a lower quality', () => {
+		const bytes = (quality: number) => estimateVariant(request({ quality }))!.bytes
+		const sizes = [1, 20, 40, 60, 80, 100].map(bytes)
+
+		expect(sizes).toEqual([...sizes].sort((left, right) => left - right))
+	})
+
+	it('never exceeds the original size', () => {
+		const estimate = estimateVariant(
+			request({ width: 8000, height: 8000, format: 'png', quality: 100 }),
+		)
+
+		expect(estimate!.bytes).toBeLessThanOrEqual(SAMPLE_SOURCE.bytes)
+	})
+
+	it('is empty without a dimension', () => {
+		expect(estimateVariant(request({ width: null, height: null }))).toBeNull()
+	})
+})
diff --git a/web/src/lib/variants/__tests__/variantForm.spec.ts b/web/src/lib/variants/__tests__/variantForm.spec.ts
new file mode 100644
index 0000000..2a39453
--- /dev/null
+++ b/web/src/lib/variants/__tests__/variantForm.spec.ts
@@ -0,0 +1,156 @@
+import { describe, expect, it } from 'vitest'
+import {
+	VARIANT_TEMPLATES,
+	blankValues,
+	hasChanged,
+	lacksDimension,
+	sliderValue,
+	toDefinition,
+	toNewVariant,
+	validateField,
+	valuesFromTemplate,
+	valuesFromVariant,
+	type FieldName,
+	type VariantFormValues,
+} from '../variantForm'
+
+const NAME_ERROR = 'Use lowercase letters, numbers and dashes, 2 to 32 characters.'
+const RANGE_ERROR = 'Enter a value from 1 to 8000.'
+const QUALITY_ERROR = 'Enter a value from 1 to 100.'
+
+function values(overrides: Partial<VariantFormValues>): VariantFormValues {
+	return { ...blankValues(), name: 'hero', width: '1200', height: '630', ...overrides }
+}
+
+describe('Field errors', () => {
+	it.each([
+		['name', { name: 'Hero banner' }, NAME_ERROR],
+		['name', { name: 'a' }, NAME_ERROR],
+		['name', { name: 'a'.repeat(33) }, NAME_ERROR],
+		['width', { width: '9000' }, RANGE_ERROR],
+		['width', { width: '0' }, RANGE_ERROR],
+		['height', { height: '8001' }, RANGE_ERROR],
+		['quality', { quality: '140' }, QUALITY_ERROR],
+		['quality', { quality: '0' }, QUALITY_ERROR],
+	] as [FieldName, Partial<VariantFormValues>, string][])(
+		'%s %j reads the message',
+		(field, overrides, message) => {
+			expect(validateField(field, values(overrides))).toBe(message)
+		},
+	)
+
+	it.each([
+		['name', { name: 'ab' }],
+		['name', { name: 'a-b-c' }],
+		['name', { name: 'a'.repeat(32) }],
+		['width', { width: '1' }],
+		['height', { height: '8000' }],
+		['quality', { quality: '1' }],
+		['quality', { quality: '100' }],
+	] as [FieldName, Partial<VariantFormValues>][])('%s %j shows no error', (field, overrides) => {
+		expect(validateField(field, values(overrides))).toBeUndefined()
+	})
+
+	it('does not validate the quality of a PNG', () => {
+		expect(validateField('quality', values({ format: 'png', quality: '999' }))).toBeUndefined()
+	})
+
+	it('treats an empty dimension as absent', () => {
+		expect(validateField('width', values({ width: '' }))).toBeUndefined()
+		expect(lacksDimension(values({ width: '', height: '' }))).toBe(true)
+		expect(lacksDimension(values({ width: '', height: '9' }))).toBe(false)
+	})
+})
+
+describe('Request body', () => {
+	it('builds the create body from the form', () => {
+		const body = toNewVariant(
+			values({ format: 'webp', quality: '82', generateOnUpload: true, enabled: true }),
+		)
+
+		expect(body).toEqual({
+			name: 'hero',
+			width: 1200,
+			height: 630,
+			fit: 'cover',
+			format: 'webp',
+			quality: 82,
+			generate_on_upload: true,
+			enabled: true,
+		})
+	})
+
+	it('sends an empty dimension as null', () => {
+		const body = toNewVariant(values({ name: 'card', width: '800', height: '' }))
+
+		expect(body.width).toBe(800)
+		expect(body.height).toBeNull()
+	})
+
+	it('omits the quality of a PNG', () => {
+		const definition = toDefinition(values({ format: 'png', quality: '70' }))
+
+		expect('quality' in definition).toBe(false)
+	})
+})
+
+describe('Form values', () => {
+	it('starts blank with the documented defaults', () => {
+		expect(blankValues()).toEqual({
+			name: '',
+			width: '',
+			height: '',
+			fit: 'cover',
+			format: 'original',
+			quality: '80',
+			generateOnUpload: false,
+			enabled: true,
+		})
+	})
+
+	it.each([
+		['thumb', '400', '300', '80'],
+		['hero', '1200', '630', '82'],
+	])('template %s pre-fills %s×%s q%s as cover WebP', (name, width, height, quality) => {
+		const template = VARIANT_TEMPLATES.find((entry) => entry.name === name)!
+
+		expect(valuesFromTemplate(template)).toMatchObject({
+			name,
+			width,
+			height,
+			quality,
+			fit: 'cover',
+			format: 'webp',
+			generateOnUpload: false,
+			enabled: true,
+		})
+	})
+
+	it('reads a stored PNG variant with a default hidden quality', () => {
+		const form = valuesFromVariant({
+			name: 'print',
+			width: null,
+			height: 2400,
+			fit: 'inside',
+			format: 'png',
+			quality: null,
+			generate_on_upload: false,
+			enabled: false,
+			generated_files: 74,
+			cache_size: 0,
+		})
+
+		expect([form.width, form.height, form.quality]).toEqual(['', '2400', '80'])
+	})
+
+	it('detects a change against the baseline', () => {
+		expect(hasChanged(blankValues(), blankValues())).toBe(false)
+		expect(hasChanged({ ...blankValues(), name: 'x' }, blankValues())).toBe(true)
+	})
+
+	it('clamps the slider position', () => {
+		expect([sliderValue('60'), sliderValue('140'), sliderValue('0'), sliderValue('')]).toEqual([
+			60, 100, 1, 1,
+		])
+	})
+})
diff --git a/web/src/lib/variants/__tests__/variantFormat.spec.ts b/web/src/lib/variants/__tests__/variantFormat.spec.ts
new file mode 100644
index 0000000..4864943
--- /dev/null
+++ b/web/src/lib/variants/__tests__/variantFormat.spec.ts
@@ -0,0 +1,170 @@
+import { afterEach, describe, expect, it } from 'vitest'
+import { initializeLocale, setLocale } from '@/i18n'
+import type { ImageVariant } from '@/composables/useImageVariants'
+import {
+	formatDimensions,
+	formatLabel,
+	formatVariantSize,
+	generatedLine,
+	qualityCell,
+	specLine,
+	variantsSummary,
+} from '../variantFormat'
+
+const MB = 1048576
+
+function variant(overrides: Partial<ImageVariant>): ImageVariant {
+	return {
+		name: 'hero',
+		width: 1200,
+		height: 630,
+		fit: 'cover',
+		format: 'webp',
+		quality: 82,
+		generate_on_upload: false,
+		enabled: true,
+		generated_files: 244,
+		cache_size: 84 * MB,
+		...overrides,
+	}
+}
+
+function defaultFixture(): ImageVariant[] {
+	return [
+		variant({
+			name: 'card',
+			width: 800,
+			height: null,
+			fit: 'inside',
+			quality: 80,
+			generated_files: 318,
+			cache_size: 58 * MB,
+		}),
+		variant({ name: 'hero' }),
+		variant({
+			name: 'og',
+			format: 'jpeg',
+			quality: 80,
+			generated_files: 96,
+			cache_size: 9 * MB,
+		}),
+		variant({
+			name: 'print',
+			width: null,
+			height: 2400,
+			fit: 'inside',
+			format: 'png',
+			quality: null,
+			enabled: false,
+			generated_files: 74,
+			cache_size: 21 * MB,
+		}),
+		variant({
+			name: 'square',
+			width: 600,
+			height: 600,
+			format: 'jpeg',
+			quality: 85,
+			generated_files: 140,
+			cache_size: 19 * MB,
+		}),
+		variant({
+			name: 'thumb',
+			width: 400,
+			height: 300,
+			quality: 80,
+			generated_files: 412,
+			cache_size: 21 * MB,
+		}),
+	]
+}
+
+afterEach(() => {
+	localStorage.clear()
+	initializeLocale()
+})
+
+describe('Dimensions, quality and format cells', () => {
+	it.each([
+		[400, 300, 'webp', 80, '400×300', 'WebP', '80'],
+		[800, null, 'jpeg', 80, '800 × auto', 'JPEG', '80'],
+		[null, 2400, 'png', null, 'auto × 2400', 'PNG', '—'],
+		[600, 600, 'original', 82, '600×600', 'Original', '82'],
+	] as const)(
+		'width %s height %s format %s quality %s reads %s, %s, %s',
+		(width, height, format, quality, dimensions, label, cell) => {
+			const entry = variant({ width, height, format, quality })
+
+			expect(formatDimensions(entry.width, entry.height)).toBe(dimensions)
+			expect(formatLabel(entry.format)).toBe(label)
+			expect(qualityCell(entry)).toBe(cell)
+		},
+	)
+})
+
+describe('Spec line of a mobile card', () => {
+	it('joins dimensions, fit, format and quality', () => {
+		expect(specLine(variant({}))).toBe('1200×630 · cover · WebP · q82')
+	})
+
+	it('has no quality part for print', () => {
+		const print = defaultFixture()[3]!
+
+		expect(specLine(print)).toBe('auto × 2400 · inside · PNG')
+	})
+
+	it('reads the generated count and size', () => {
+		expect(generatedLine(variant({}))).toBe('244 generated · 84 MB')
+	})
+})
+
+describe('Footer sums are computed from the list', () => {
+	it('sums the Default fixture', () => {
+		expect(variantsSummary(defaultFixture())).toBe(
+			'6 variants · 1,284 generated files · 212 MB',
+		)
+	})
+
+	it('uses the singular for one variant with one file', () => {
+		const thumb = variant({ name: 'thumb', generated_files: 1, cache_size: 18 * 1024 })
+
+		expect(variantsSummary([thumb])).toBe('1 variant · 1 generated file · 18 KB')
+	})
+
+	it('recomputes after a deletion', () => {
+		const rest = defaultFixture().filter((entry) => entry.name !== 'hero')
+
+		expect(variantsSummary(rest)).toBe('5 variants · 1,040 generated files · 128 MB')
+	})
+
+	it('reads an empty cache as 0 KB', () => {
+		expect(variantsSummary([variant({ generated_files: 0, cache_size: 0 })])).toBe(
+			'1 variant · 0 generated files · 0 KB',
+		)
+	})
+})
+
+describe('Variant size formatter', () => {
+	it.each([
+		[0, '0 KB'],
+		[1, '1 KB'],
+		[18 * 1024, '18 KB'],
+		[1023 * 1024, '1023 KB'],
+		[MB, '1 MB'],
+		[Math.round(3.9 * MB), '3.9 MB'],
+		[84 * MB, '84 MB'],
+		[88080384, '84 MB'],
+		[2048 * MB, '2 GB'],
+	])('formats %s bytes as %s', (bytes, expected) => {
+		expect(formatVariantSize(bytes)).toBe(expected)
+	})
+
+	it('uses French units and decimal comma', () => {
+		setLocale('fr')
+
+		expect([formatVariantSize(18 * 1024), formatVariantSize(Math.round(3.9 * MB))]).toEqual([
+			'18 Ko',
+			'3,9 Mo',
+		])
+	})
+})
diff --git a/web/src/lib/variants/variantErrors.ts b/web/src/lib/variants/variantErrors.ts
new file mode 100644
index 0000000..9b36632
--- /dev/null
+++ b/web/src/lib/variants/variantErrors.ts
@@ -0,0 +1,47 @@
+import { t } from '@/i18n'
+import { ApiError } from '@/composables/useApi'
+
+export interface ToastCopy {
+	title: string
+	description: string
+}
+
+const BAD_REQUEST = 400
+const FORBIDDEN = 403
+const NOT_FOUND = 404
+
+export function toastCopyFor(error: unknown): ToastCopy {
+	const status = error instanceof ApiError ? error.status : 0
+	if (status === BAD_REQUEST) {
+		return {
+			title: t('Check the request'),
+			description: t("A value in the request isn't valid. Reload the page and try again."),
+		}
+	}
+	if (status === FORBIDDEN) {
+		return {
+			title: t("You don't have access"),
+			description: t('Only admins can manage image variants.'),
+		}
+	}
+	if (status === NOT_FOUND) {
+		return {
+			title: t('Not found'),
+			description: t('This variant or image no longer exists. Refresh the page.'),
+		}
+	}
+	return {
+		title: t('Something went wrong'),
+		description: t(
+			"The server couldn't finish. Try again. If it keeps happening, check the server log.",
+		),
+	}
+}
+
+export function isStatus(error: unknown, status: number) {
+	return error instanceof ApiError && error.status === status
+}
+
+export function isHandledByApiClient(error: unknown) {
+	return error instanceof ApiError && error.status === 401
+}
diff --git a/web/src/lib/variants/variantEstimate.ts b/web/src/lib/variants/variantEstimate.ts
new file mode 100644
index 0000000..4ac5d99
--- /dev/null
+++ b/web/src/lib/variants/variantEstimate.ts
@@ -0,0 +1,64 @@
+import { t } from '@/i18n'
+import type { VariantFormat } from '@/composables/useImageVariants'
+import { formatVariantSize } from '@/lib/variants/variantFormat'
+import { outputSize, type OutputRequest, type PixelSize } from '@/lib/variants/variantOutput'
+
+export type { PixelSize } from '@/lib/variants/variantOutput'
+
+const BYTES_PER_MB = 1024 * 1024
+const FULL_QUALITY = 100
+const PNG_BYTES_PER_PIXEL = 0.42
+const SIZE_EXPONENT = 0.885
+const QUALITY_EXPONENT = 1.9
+
+const LOSSY_BASE: Record<Exclude<VariantFormat, 'png'>, number> = {
+	webp: 0.9,
+	jpeg: 1.4,
+	original: 1.4,
+}
+
+export const SAMPLE_SOURCE = {
+	filename: 'north-wall.jpg',
+	width: 4032,
+	height: 3024,
+	bytes: Math.round(3.9 * BYTES_PER_MB),
+}
+
+export interface EstimateRequest extends OutputRequest {
+	format: VariantFormat
+	quality: number
+}
+
+export interface VariantEstimate {
+	size: PixelSize
+	bytes: number
+}
+
+function rawBytes(pixels: number, request: EstimateRequest) {
+	if (request.format === 'png') {
+		return pixels * PNG_BYTES_PER_PIXEL
+	}
+	const quality = Math.min(FULL_QUALITY, Math.max(1, request.quality)) / FULL_QUALITY
+	return (
+		LOSSY_BASE[request.format] *
+		Math.pow(pixels, SIZE_EXPONENT) *
+		Math.pow(quality, QUALITY_EXPONENT)
+	)
+}
+
+export function estimateVariant(request: EstimateRequest): VariantEstimate | null {
+	const size = outputSize(SAMPLE_SOURCE, request)
+	if (size === null) {
+		return null
+	}
+	const bytes = Math.min(SAMPLE_SOURCE.bytes, rawBytes(size.width * size.height, request))
+	return { size, bytes }
+}
+
+export function formatPixelSize(size: PixelSize) {
+	return `${size.width}×${size.height}`
+}
+
+export function estimateLabel(estimate: VariantEstimate) {
+	return t('{0} · about {1}', [formatPixelSize(estimate.size), formatVariantSize(estimate.bytes)])
+}
diff --git a/web/src/lib/variants/variantForm.ts b/web/src/lib/variants/variantForm.ts
new file mode 100644
index 0000000..fd4d4bb
--- /dev/null
+++ b/web/src/lib/variants/variantForm.ts
@@ -0,0 +1,154 @@
+import { t } from '@/i18n'
+import type {
+	ImageVariant,
+	NewVariantRequest,
+	VariantDefinition,
+	VariantFit,
+	VariantFormat,
+} from '@/composables/useImageVariants'
+
+export const NAME_MAX_LENGTH = 32
+const DIMENSION_MIN = 1
+const DIMENSION_MAX = 8000
+export const QUALITY_MIN = 1
+export const QUALITY_MAX = 100
+const DEFAULT_QUALITY = 80
+
+const NAME_PATTERN = /^[a-z0-9-]{2,32}$/
+const WHOLE_NUMBER = /^\d+$/
+
+export type FieldName = 'name' | 'width' | 'height' | 'quality'
+
+export interface VariantFormValues {
+	name: string
+	width: string
+	height: string
+	fit: VariantFit
+	format: VariantFormat
+	quality: string
+	generateOnUpload: boolean
+	enabled: boolean
+}
+
+export type FieldErrors = Partial<Record<FieldName, string>> & { dimension?: string }
+
+export const FIELD_ORDER: FieldName[] = ['name', 'width', 'height', 'quality']
+
+export const VARIANT_TEMPLATES = [
+	{ name: 'thumb', width: 400, height: 300, quality: 80 },
+	{ name: 'hero', width: 1200, height: 630, quality: 82 },
+] as const
+
+export function blankValues(): VariantFormValues {
+	return {
+		name: '',
+		width: '',
+		height: '',
+		fit: 'cover',
+		format: 'original',
+		quality: String(DEFAULT_QUALITY),
+		generateOnUpload: false,
+		enabled: true,
+	}
+}
+
+export function valuesFromTemplate(
+	template: (typeof VARIANT_TEMPLATES)[number],
+): VariantFormValues {
+	return {
+		...blankValues(),
+		name: template.name,
+		width: String(template.width),
+		height: String(template.height),
+		format: 'webp',
+		quality: String(template.quality),
+	}
+}
+
+export function valuesFromVariant(variant: ImageVariant): VariantFormValues {
+	return {
+		name: variant.name,
+		width: variant.width === null ? '' : String(variant.width),
+		height: variant.height === null ? '' : String(variant.height),
+		fit: variant.fit,
+		format: variant.format,
+		quality: String(variant.quality ?? DEFAULT_QUALITY),
+		generateOnUpload: variant.generate_on_upload,
+		enabled: variant.enabled,
+	}
+}
+
+export function hasChanged(current: VariantFormValues, initial: VariantFormValues) {
+	return (Object.keys(initial) as (keyof VariantFormValues)[]).some(
+		(key) => current[key] !== initial[key],
+	)
+}
+
+export function usesQuality(format: VariantFormat) {
+	return format !== 'png'
+}
+
+function wholeNumberInRange(text: string, min: number, max: number) {
+	const trimmed = text.trim()
+	if (!WHOLE_NUMBER.test(trimmed)) {
+		return null
+	}
+	const value = Number(trimmed)
+	return value >= min && value <= max ? value : null
+}
+
+export function parseDimension(text: string) {
+	return wholeNumberInRange(text, DIMENSION_MIN, DIMENSION_MAX)
+}
+
+function parseQuality(text: string) {
+	return wholeNumberInRange(text, QUALITY_MIN, QUALITY_MAX)
+}
+
+export function validateField(field: FieldName, values: VariantFormValues): string | undefined {
+	if (field === 'name') {
+		return NAME_PATTERN.test(values.name)
+			? undefined
+			: t('Use lowercase letters, numbers and dashes, 2 to 32 characters.')
+	}
+	if (field === 'quality') {
+		return !usesQuality(values.format) || parseQuality(values.quality) !== null
+			? undefined
+			: t('Enter a value from 1 to 100.')
+	}
+	const text = values[field]
+	return text.trim() === '' || parseDimension(text) !== null
+		? undefined
+		: t('Enter a value from 1 to 8000.')
+}
+
+export function lacksDimension(values: VariantFormValues) {
+	return values.width.trim() === '' && values.height.trim() === ''
+}
+
+export function sliderValue(text: string) {
+	const parsed = Number.parseInt(text, 10)
+	if (Number.isNaN(parsed)) {
+		return QUALITY_MIN
+	}
+	return Math.min(QUALITY_MAX, Math.max(QUALITY_MIN, parsed))
+}
+
+export function toDefinition(values: VariantFormValues): VariantDefinition {
+	const definition: VariantDefinition = {
+		width: parseDimension(values.width),
+		height: parseDimension(values.height),
+		fit: values.fit,
+		format: values.format,
+		generate_on_upload: values.generateOnUpload,
+		enabled: values.enabled,
+	}
+	if (usesQuality(values.format)) {
+		definition.quality = parseQuality(values.quality) ?? DEFAULT_QUALITY
+	}
+	return definition
+}
+
+export function toNewVariant(values: VariantFormValues): NewVariantRequest {
+	return { name: values.name, ...toDefinition(values) }
+}
diff --git a/web/src/lib/variants/variantFormat.ts b/web/src/lib/variants/variantFormat.ts
new file mode 100644
index 0000000..516f685
--- /dev/null
+++ b/web/src/lib/variants/variantFormat.ts
@@ -0,0 +1,93 @@
+import { formatNumber, t } from '@/i18n'
+import type { ImageVariant, VariantFit, VariantFormat } from '@/composables/useImageVariants'
+
+const BYTES_PER_KB = 1024
+const BYTES_PER_MB = BYTES_PER_KB * 1024
+const KB_PER_MB = 1024
+const MB_PER_GB = 1024
+const NO_QUALITY = '—'
+const SEPARATOR = ' · '
+
+function oneDecimal(value: number) {
+	return Math.round(value * 10) / 10
+}
+
+export function formatVariantSize(bytes: number) {
+	const kilobytes = Math.round(bytes / BYTES_PER_KB)
+	if (bytes === 0) {
+		return t('{0} KB', [0])
+	}
+	if (kilobytes < KB_PER_MB) {
+		return t('{0} KB', [Math.max(1, kilobytes)])
+	}
+	const megabytes = bytes / BYTES_PER_MB
+	if (megabytes < MB_PER_GB) {
+		return t('{0} MB', [oneDecimal(megabytes)])
+	}
+	return t('{0} GB', [oneDecimal(megabytes / MB_PER_GB)])
+}
+
+export function formatDimensions(width: number | null, height: number | null) {
+	if (width !== null && height !== null) {
+		return `${width}×${height}`
+	}
+	if (width !== null) {
+		return `${width} × ${t('auto')}`
+	}
+	return `${t('auto')} × ${height ?? ''}`
+}
+
+export function formatLabel(format: VariantFormat) {
+	const labels: Record<VariantFormat, string> = {
+		webp: 'WebP',
+		jpeg: 'JPEG',
+		png: 'PNG',
+		original: t('Original'),
+	}
+	return labels[format]
+}
+
+export function fitLabel(fit: VariantFit) {
+	const labels: Record<VariantFit, string> = {
+		cover: t('cover'),
+		contain: t('contain'),
+		inside: t('inside'),
+	}
+	return labels[fit]
+}
+
+function hasQuality(variant: Pick<ImageVariant, 'format' | 'quality'>) {
+	return variant.format !== 'png' && variant.quality !== null
+}
+
+export function qualityCell(variant: Pick<ImageVariant, 'format' | 'quality'>) {
+	return hasQuality(variant) ? String(variant.quality) : NO_QUALITY
+}
+
+export function specLine(variant: ImageVariant) {
+	const parts = [
+		formatDimensions(variant.width, variant.height),
+		fitLabel(variant.fit),
+		formatLabel(variant.format),
+	]
+	if (hasQuality(variant)) {
+		parts.push(t('q{0}', [variant.quality ?? 0]))
+	}
+	return parts.join(SEPARATOR)
+}
+
+export function generatedLine(variant: ImageVariant) {
+	return t('{0} generated · {1}', [
+		formatNumber(variant.generated_files),
+		formatVariantSize(variant.cache_size),
+	])
+}
+
+export function variantsSummary(items: readonly ImageVariant[]) {
+	const files = items.reduce((total, item) => total + item.generated_files, 0)
+	const bytes = items.reduce((total, item) => total + item.cache_size, 0)
+	const variants = items.length === 1 ? t('1 variant') : t('{0} variants', [items.length])
+	const generated =
+		files === 1 ? t('1 generated file') : t('{0} generated files', [formatNumber(files)])
+	return [variants, generated, formatVariantSize(bytes)].join(SEPARATOR)
+}
diff --git a/web/src/lib/variants/variantOutput.ts b/web/src/lib/variants/variantOutput.ts
new file mode 100644
index 0000000..a989904
--- /dev/null
+++ b/web/src/lib/variants/variantOutput.ts
@@ -0,0 +1,54 @@
+import type { VariantFit } from '@/composables/useImageVariants'
+
+export interface PixelSize {
+	width: number
+	height: number
+}
+
+export interface OutputRequest {
+	width: number | null
+	height: number | null
+	fit: VariantFit
+}
+
+function scaled(size: PixelSize, factor: number): PixelSize {
+	return { width: Math.round(size.width * factor), height: Math.round(size.height * factor) }
+}
+
+function singleDimension(source: PixelSize, width: number | null, height: number | null) {
+	const factor = width !== null ? width / source.width : (height ?? 0) / source.height
+	return scaled(source, Math.min(1, factor))
+}
+
+function cropToBox(source: PixelSize, box: PixelSize): PixelSize {
+	const boxRatio = box.width / box.height
+	if (source.width / source.height > boxRatio) {
+		return { width: source.height * boxRatio, height: source.height }
+	}
+	return { width: source.width, height: source.width / boxRatio }
+}
+
+function coverBox(source: PixelSize, box: PixelSize) {
+	if (box.width >= source.width && box.height >= source.height) {
+		return source
+	}
+	const crop = cropToBox(source, box)
+	return scaled(crop, Math.min(1, box.width / crop.width))
+}
+
+export function outputSize(source: PixelSize, request: OutputRequest): PixelSize | null {
+	const { width, height, fit } = request
+	if (width === null && height === null) {
+		return null
+	}
+	if (width === null || height === null) {
+		return singleDimension(source, width, height)
+	}
+	if (fit === 'contain') {
+		return { width, height }
+	}
+	if (fit === 'inside') {
+		return scaled(source, Math.min(1, width / source.width, height / source.height))
+	}
+	return coverBox(source, { width, height })
+}
diff --git a/web/src/router/index.ts b/web/src/router/index.ts
index 7c89f57..b863f72 100644
--- a/web/src/router/index.ts
+++ b/web/src/router/index.ts
@@ -106,6 +106,11 @@ const router = createRouter({
 			component: () => import('@/views/SettingsView.vue'),
 			meta: { auth: 'verified', title: 'Settings' },
 		},
+		{
+			path: '/settings/media/variants',
+			component: () => import('@/views/VariantsPage.vue'),
+			meta: { auth: 'verified', title: 'Settings' },
+		},
 		{
 			path: '/:pathMatch(.*)*',
 			component: () => import('@/views/NotFoundView.vue'),
diff --git a/web/src/stores/imageVariants.ts b/web/src/stores/imageVariants.ts
new file mode 100644
index 0000000..1a90901
--- /dev/null
+++ b/web/src/stores/imageVariants.ts
@@ -0,0 +1,144 @@
+import { defineStore } from 'pinia'
+import { computed, ref } from 'vue'
+import { ApiError } from '@/composables/useApi'
+import {
+	useImageVariants,
+	type ImageVariant,
+	type NewVariantRequest,
+	type PurgeResult,
+	type SavedVariant,
+	type VariantDefinition,
+} from '@/composables/useImageVariants'
+
+export type VariantsLoadState = 'loading' | 'ready' | 'error' | 'forbidden'
+
+const FORBIDDEN_STATUS = 403
+const UNAUTHORIZED_STATUS = 401
+
+function byName(left: ImageVariant, right: ImageVariant) {
+	if (left.name === right.name) {
+		return 0
+	}
+	return left.name < right.name ? -1 : 1
+}
+
+export const useImageVariantsStore = defineStore('imageVariants', () => {
+	const api = useImageVariants()
+	const items = ref<ImageVariant[]>([])
+	const loadState = ref<VariantsLoadState>('loading')
+	const toggling = ref<Record<string, boolean>>({})
+	const purging = ref<string[]>([])
+
+	const isEmpty = computed(() => loadState.value === 'ready' && items.value.length === 0)
+
+	function find(name: string) {
+		return items.value.find((item) => item.name === name)
+	}
+
+	function enabledOf(item: ImageVariant) {
+		return toggling.value[item.name] ?? item.enabled
+	}
+
+	function isToggling(name: string) {
+		return name in toggling.value
+	}
+
+	function isPurging(name: string) {
+		return purging.value.includes(name)
+	}
+
+	function isBusy(name: string) {
+		return isToggling(name) || isPurging(name)
+	}
+
+	function replace(variant: ImageVariant) {
+		items.value = items.value.map((item) => (item.name === variant.name ? variant : item))
+	}
+
+	async function load() {
+		loadState.value = 'loading'
+		try {
+			items.value = await api.listVariants()
+			loadState.value = 'ready'
+		} catch (error) {
+			if (error instanceof ApiError && error.status === FORBIDDEN_STATUS) {
+				loadState.value = 'forbidden'
+				return
+			}
+			if (error instanceof ApiError && error.status === UNAUTHORIZED_STATUS) {
+				return
+			}
+			loadState.value = 'error'
+		}
+	}
+
+	async function reloadQuietly() {
+		try {
+			items.value = await api.listVariants()
+		} catch {
+			return
+		}
+	}
+
+	async function toggle(name: string, enabled: boolean) {
+		toggling.value = { ...toggling.value, [name]: enabled }
+		try {
+			replace(await api.setVariantEnabled(name, enabled))
+		} finally {
+			const next = { ...toggling.value }
+			delete next[name]
+			toggling.value = next
+		}
+	}
+
+	async function purge(name: string): Promise<PurgeResult> {
+		purging.value = [...purging.value, name]
+		try {
+			const result = await api.purgeVariant(name)
+			const current = find(name)
+			if (current) {
+				replace({ ...current, generated_files: 0, cache_size: 0 })
+			}
+			return result
+		} finally {
+			purging.value = purging.value.filter((entry) => entry !== name)
+		}
+	}
+
+	async function remove(name: string) {
+		await api.deleteVariant(name)
+		items.value = items.value.filter((item) => item.name !== name)
+	}
+
+	async function create(input: NewVariantRequest) {
+		const created = await api.createVariant(input)
+		items.value = [...items.value, created].sort(byName)
+		return created
+	}
+
+	async function save(name: string, definition: VariantDefinition): Promise<SavedVariant> {
+		const saved = await api.replaceVariant(name, definition)
+		const variant: SavedVariant = { ...saved }
+		delete variant.purged_files
+		replace(variant)
+		return saved
+	}
+
+	return {
+		items,
+		loadState,
+		isEmpty,
+		find,
+		enabledOf,
+		isToggling,
+		isPurging,
+		isBusy,
+		load,
+		reloadQuietly,
+		toggle,
+		purge,
+		remove,
+		create,
+		save,
+	}
+})
diff --git a/web/src/views/VariantsPage.vue b/web/src/views/VariantsPage.vue
new file mode 100644
index 0000000..023ba6b
--- /dev/null
+++ b/web/src/views/VariantsPage.vue
@@ -0,0 +1,420 @@
+<script setup lang="ts">
+import { formatNumber, t } from '@/i18n'
+
+import { computed, nextTick, onBeforeUnmount, ref, watch } from 'vue'
+import { useMediaQuery } from '@vueuse/core'
+import { useRouter } from 'vue-router'
+import { useLocalizedOverlay } from '@/i18n/presentation'
+import ConfirmDialog from '@/components/ConfirmDialog.vue'
+import DashboardShell from '@/components/DashboardShell.vue'
+import RequestReferenceCard from '@/components/variants/RequestReferenceCard.vue'
+import VariantCardList from '@/components/variants/VariantCardList.vue'
+import VariantFormSlideover from '@/components/variants/VariantFormSlideover.vue'
+import VariantsEmpty from '@/components/variants/VariantsEmpty.vue'
+import VariantsForbidden from '@/components/variants/VariantsForbidden.vue'
+import VariantsSkeleton from '@/components/variants/VariantsSkeleton.vue'
+import VariantsTable from '@/components/variants/VariantsTable.vue'
+import VariantsTabs from '@/components/variants/VariantsTabs.vue'
+import type { ImageVariant } from '@/composables/useImageVariants'
+import type { FormMode } from '@/composables/useVariantForm'
+import { useVariantToasts } from '@/composables/useVariantToasts'
+import { isHandledByApiClient, isStatus } from '@/lib/variants/variantErrors'
+import {
+	VARIANT_TEMPLATES,
+	blankValues,
+	valuesFromTemplate,
+	valuesFromVariant,
+	type VariantFormValues,
+} from '@/lib/variants/variantForm'
+import { formatVariantSize } from '@/lib/variants/variantFormat'
+import { useImageVariantsStore } from '@/stores/imageVariants'
+import { useSessionStore } from '@/stores/session'
+
+const DESKTOP_QUERY = '(min-width: 40rem)'
+const SKELETON_DELAY_MS = 150
+const NOT_FOUND = 404
+
+interface FormTarget {
+	mode: FormMode
+	initial: VariantFormValues
+	variant?: ImageVariant
+}
+
+const router = useRouter()
+const session = useSessionStore()
+const store = useImageVariantsStore()
+const overlay = useLocalizedOverlay()
+const { announceFailure, announceSuccess } = useVariantToasts()
+const isDesktop = useMediaQuery(DESKTOP_QUERY)
+
+const showSkeleton = ref(false)
+const formTarget = ref<FormTarget | null>(null)
+let skeletonTimer: ReturnType<typeof setTimeout> | null = null
+let formOpener: HTMLElement | null = null
+let requested = false
+
+const sessionReady = computed(() => session.status === 'ready')
+const canManage = computed(
+	() => session.session?.role === 'owner' || session.session?.role === 'admin',
+)
+const forbidden = computed(
+	() => (sessionReady.value && !canManage.value) || store.loadState === 'forbidden',
+)
+const ready = computed(() => store.loadState === 'ready')
+
+function clearSkeletonTimer() {
+	if (skeletonTimer !== null) {
+		clearTimeout(skeletonTimer)
+		skeletonTimer = null
+	}
+}
+
+async function loadVariants() {
+	showSkeleton.value = false
+	clearSkeletonTimer()
+	skeletonTimer = setTimeout(() => {
+		showSkeleton.value = true
+	}, SKELETON_DELAY_MS)
+	const loading = store.load()
+	try {
+		await loading
+	} finally {
+		clearSkeletonTimer()
+		showSkeleton.value = false
+	}
+}
+
+watch(
+	[sessionReady, canManage],
+	([isReady, isAdmin]) => {
+		if (isReady && isAdmin && !requested) {
+			requested = true
+			loadVariants()
+		}
+	},
+	{ immediate: true },
+)
+
+onBeforeUnmount(clearSkeletonTimer)
+
+function rowMenuButton(name: string) {
+	const label = t('Actions for {0}', [name])
+	return (
+		Array.from(document.querySelectorAll<HTMLElement>('button[aria-label]')).find(
+			(button) => button.getAttribute('aria-label') === label,
+		) ?? null
+	)
+}
+
+function rememberOpener(element?: HTMLElement | null) {
+	formOpener =
+		element ?? (document.activeElement instanceof HTMLElement ? document.activeElement : null)
+}
+
+async function restoreFocus(element: HTMLElement | null) {
+	await nextTick()
+	if (element?.isConnected) {
+		element.focus()
+	}
+}
+
+function openCreate(initial: VariantFormValues = blankValues()) {
+	rememberOpener()
+	formTarget.value = { mode: 'create', initial }
+}
+
+function openTemplate(name: string) {
+	const template = VARIANT_TEMPLATES.find((entry) => entry.name === name)
+	if (template) {
+		openCreate(valuesFromTemplate(template))
+	}
+}
+
+function openEdit(name: string) {
+	const variant = store.find(name)
+	if (!variant) {
+		return
+	}
+	rememberOpener(rowMenuButton(name))
+	formTarget.value = { mode: 'edit', initial: valuesFromVariant(variant), variant }
+}
+
+function closeForm() {
+	formTarget.value = null
+	restoreFocus(formOpener)
+}
+
+function onSaved(result: { mode: FormMode; name: string; purgedFiles: number }) {
+	closeForm()
+	announceSuccess(() => {
+		if (result.mode === 'create') {
+			return t('Variant “{0}” added', [result.name])
+		}
+		if (result.purgedFiles === 0) {
+			return t('Variant “{0}” saved.', [result.name])
+		}
+		return result.purgedFiles === 1
+			? t('Variant “{0}” saved. 1 file purged.', [result.name])
+			: t('Variant “{0}” saved. {1} files purged.', [
+					result.name,
+					formatNumber(result.purgedFiles),
+				])
+	})
+}
+
+async function onToggle(name: string, value: boolean) {
+	try {
+		await store.toggle(name, value)
+	} catch (error) {
+		if (!isHandledByApiClient(error)) {
+			announceFailure(error)
+		}
+	}
+}
+
+function generatedFilesText(count: number) {
+	return count === 1 ? t('1 generated file') : t('{0} generated files', [formatNumber(count)])
+}
+
+async function onPurge(name: string) {
+	const variant = store.find(name)
+	if (!variant) {
+		return
+	}
+	const trigger = rowMenuButton(name)
+	const confirmed = await overlay
+		.create(ConfirmDialog, {
+			props: {
+				get title() {
+					return t('Purge cache for “{0}”?', [name])
+				},
+				get description() {
+					return t(
+						'This removes {0} ({1}). Files are generated again on the next request.',
+						[
+							generatedFilesText(variant.generated_files),
+							formatVariantSize(variant.cache_size),
+						],
+					)
+				},
+				get confirmLabel() {
+					return variant.generated_files === 1
+						? t('Purge 1 file')
+						: t('Purge {0} files', [formatNumber(variant.generated_files)])
+				},
+				get cancelLabel() {
+					return t('Cancel')
+				},
+				get pendingLabel() {
+					return t('Purging…')
+				},
+				tone: 'neutral',
+				action: async () => undefined,
+			},
+		})
+		.open()
+	restoreFocus(trigger)
+	if (!confirmed) {
+		return
+	}
+	try {
+		const result = await store.purge(name)
+		announceSuccess(() =>
+			result.purged_files === 1
+				? t('Purged 1 file from “{0}”', [name])
+				: t('Purged {0} files from “{1}”', [formatNumber(result.purged_files), name]),
+		)
+	} catch (error) {
+		if (!isHandledByApiClient(error)) {
+			announceFailure(error)
+		}
+	}
+}
+
+async function onDelete(name: string) {
+	const variant = store.find(name)
+	if (!variant) {
+		return
+	}
+	const trigger = rowMenuButton(name)
+	let failure: unknown = null
+	let removed = false
+	await overlay
+		.create(ConfirmDialog, {
+			props: {
+				get title() {
+					return t('Delete variant “{0}”?', [name])
+				},
+				get description() {
+					return t(
+						"This removes the variant and its {0} ({1}). Articles that use ?v={2} will start returning 400. This can't be undone.",
+						[
+							generatedFilesText(variant.generated_files),
+							formatVariantSize(variant.cache_size),
+							name,
+						],
+					)
+				},
+				get confirmLabel() {
+					return t('Delete variant')
+				},
+				get cancelLabel() {
+					return t('Cancel')
+				},
+				get pendingLabel() {
+					return t('Delete variant')
+				},
+				tone: 'danger',
+				action: async () => {
+					try {
+						await store.remove(name)
+						removed = true
+					} catch (error) {
+						failure = error
+					}
+				},
+			},
+		})
+		.open()
+	if (removed) {
+		restoreFocus(document.querySelector<HTMLElement>('[data-testid="add-variant"]'))
+		announceSuccess(() => t('Variant “{0}” deleted', [name]))
+		return
+	}
+	restoreFocus(trigger)
+	if (failure === null || isHandledByApiClient(failure)) {
+		return
+	}
+	if (isStatus(failure, NOT_FOUND)) {
+		await store.reloadQuietly()
+	}
+	announceFailure(failure)
+}
+</script>
+
+<template>
+	<DashboardShell compact-padding :mobile-title="t('Variants')" :no-current-nav="forbidden">
+		<template #breadcrumb>
+			<UBreadcrumb
+				:items="[
+					{
+						get label() {
+							return t('Settings')
+						},
+						to: '/settings',
+					},
+					{
+						get label() {
+							return t('Media')
+						},
+					},
+					{
+						get label() {
+							return t('Variants')
+						},
+					},
+				]"
+				color="neutral"
+				class="hidden lg:block"
+				:ui="{ link: 'text-sm font-medium' }"
+			/>
+		</template>
+
+		<VariantsForbidden v-if="forbidden" @home="router.push('/home')" />
+
+		<div v-else-if="sessionReady" class="flex flex-col gap-4">
+			<div class="flex flex-col gap-3 sm:flex-row sm:items-start sm:gap-4">
+				<div class="flex min-w-0 flex-1 flex-col gap-1">
+					<h1 class="text-xl/8 font-semibold text-highlighted sm:text-stat">
+						{{ t('Image variants') }}
+					</h1>
+					<p class="max-w-155 text-pretty text-muted">
+						{{
+							t(
+								'Named sizes and formats generated from your original images. Originals are never changed.',
+							)
+						}}
+					</p>
+				</div>
+				<UButton
+					data-testid="add-variant"
+					icon="i-lucide-plus"
+					class="h-11 shrink-0 justify-center px-3 text-sm sm:h-8"
+					@click="openCreate()"
+				>
+					{{ t('Add variant') }}
+				</UButton>
+			</div>
+
+			<VariantsTabs />
+
+			<VariantsSkeleton
+				v-if="store.loadState === 'loading' && showSkeleton"
+				:desktop="isDesktop"
+			/>
+
+			<UAlert
+				v-else-if="store.loadState === 'error'"
+				role="alert"
+				color="error"
+				variant="soft"
+				orientation="vertical"
+				:close="false"
+				icon="i-lucide-circle-x"
+				:title="t('Couldn\'t load variants')"
+				:description="t('Check your connection and try again.')"
+				:ui="{ actions: 'mt-2' }"
+			>
+				<template #actions>
+					<UButton
+						color="neutral"
+						variant="outline"
+						icon="i-lucide-rotate-cw"
+						class="h-11 gap-1.5 border border-accented bg-default px-2.5 text-xs text-highlighted ring-0 sm:h-7"
+						:ui="{ leadingIcon: 'size-3.5' }"
+						@click="loadVariants"
+					>
+						{{ t('Try again') }}
+					</UButton>
+				</template>
+			</UAlert>
+
+			<VariantsEmpty v-else-if="store.isEmpty" @add="openCreate()" @template="openTemplate" />
+
+			<template v-else-if="ready">
+				<VariantsTable
+					v-if="isDesktop"
+					:items="store.items"
+					:is-enabled="store.enabledOf"
+					:is-locked="store.isBusy"
+					:is-purging="store.isPurging"
+					@toggle="onToggle"
+					@edit="openEdit"
+					@purge="onPurge"
+					@delete="onDelete"
+				/>
+				<VariantCardList
+					v-else
+					:items="store.items"
+					:is-enabled="store.enabledOf"
+					:is-locked="store.isBusy"
+					:is-purging="store.isPurging"
+					@toggle="onToggle"
+					@edit="openEdit"
+					@purge="onPurge"
+					@delete="onDelete"
+				/>
+				<RequestReferenceCard />
+			</template>
+		</div>
+
+		<VariantFormSlideover
+			v-if="formTarget"
+			:mode="formTarget.mode"
+			:initial="formTarget.initial"
+			:variant="formTarget.variant"
+			@close="closeForm"
+			@saved="onSaved"
+		/>
+	</DashboardShell>
+</template>
diff --git a/web/src/views/__tests__/VariantsForm.spec.ts b/web/src/views/__tests__/VariantsForm.spec.ts
new file mode 100644
index 0000000..3207380
--- /dev/null
+++ b/web/src/views/__tests__/VariantsForm.spec.ts
@@ -0,0 +1,1237 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
+import { flushPromises } from '@vue/test-utils'
+import UIcon from '@nuxt/ui/components/Icon.vue'
+import USelect from '@nuxt/ui/components/Select.vue'
+import { ApiError, NetworkError, useApi } from '@/composables/useApi'
+import { initializeLocale, setLocale } from '@/i18n'
+import {
+	CREATE,
+	LIST,
+	alertDialog,
+	blur,
+	bodyOf,
+	buttonByLabel,
+	buttonIn,
+	calls,
+	click,
+	clickBackdrop,
+	defaultFixture,
+	deferred,
+	field,
+	fieldHelp,
+	fieldMessage,
+	findButton,
+	menuItem,
+	mountPage,
+	openAddForm,
+	openEditForm,
+	openMenu,
+	pressEscape,
+	pressKey,
+	rows,
+	slideover,
+	stubBrowser,
+	stubClipboard,
+	textOf,
+	toastCalls,
+	typeInto,
+	unmountPage,
+	variant,
+	wrapper,
+} from './variantsTestKit'
+
+vi.mock('@/composables/useApi', async (importOriginal) => {
+	const actual = await importOriginal<typeof import('@/composables/useApi')>()
+	return { ...actual, useApi: vi.fn() }
+})
+
+const toasts = vi.hoisted(() => ({ add: vi.fn() }))
+
+vi.mock('@nuxt/ui/composables', async (importOriginal) => {
+	const actual = await importOriginal<typeof import('@nuxt/ui/composables')>()
+	return { ...actual, useToast: () => toasts }
+})
+
+const PUT_HERO = 'PUT /v1/image-variants/hero'
+const NAME_ERROR = 'Use lowercase letters, numbers and dashes, 2 to 32 characters.'
+const RANGE_ERROR = 'Enter a value from 1 to 8000.'
+const QUALITY_ERROR = 'Enter a value from 1 to 100.'
+const DIMENSION_ERROR = 'Set a width, a height, or both.'
+const DIMENSION_HELP = 'Set a width, a height, or both. 1–8000 px. Images are never enlarged.'
+const SAVE_ERROR_TITLE = "Couldn't save the variant"
+const URL_PREFIX = '/static/uploadedImages/north-wall.jpg?v='
+const WARNING_ALERT =
+	'Changing dimensions, fit, format or quality purges 244 generated files; they will be regenerated on next request.'
+
+function form() {
+	return slideover()!
+}
+
+function iconNames(root: ParentNode) {
+	return wrapper!
+		.findAllComponents(UIcon)
+		.filter((icon) => root.contains(icon.element))
+		.map((icon) => icon.props('name'))
+}
+
+function saveButton(label = 'Add variant') {
+	return buttonIn(form(), label)!
+}
+
+function footerStatus() {
+	return form().querySelector('[data-slot="footer"] div.flex-1')?.textContent?.trim() ?? ''
+}
+
+function radio(value: string) {
+	return form().querySelector<HTMLButtonElement>(`button[role="radio"][value="${value}"]`)!
+}
+
+function checkedFit() {
+	return form().querySelector('button[role="radio"][aria-checked="true"]')?.getAttribute('value')
+}
+
+function formatSelect() {
+	return wrapper!.findComponent(USelect)
+}
+
+async function setFormat(value: string) {
+	formatSelect().vm.$emit('update:modelValue', value)
+	await flushPromises()
+}
+
+function formatShown() {
+	return form().querySelector('[role="combobox"]')?.textContent?.trim()
+}
+
+function qualityInput() {
+	return field('quality')
+}
+
+function sliderThumb() {
+	return form().querySelector<HTMLElement>('[data-field="quality"] [role="slider"]')!
+}
+
+function sliderRange() {
+	return form().querySelector<HTMLElement>('[data-field="quality"] [data-slot="range"]')!
+}
+
+function compareInput() {
+	return form().querySelector<HTMLInputElement>('input[type="range"]')!
+}
+
+function switchByLabel(labelId: string) {
+	return form().querySelector<HTMLButtonElement>(
+		`button[role="switch"][aria-labelledby="${labelId}"]`,
+	)!
+}
+
+function previewText() {
+	return textOf(form().querySelector('[data-testid="image-compare"]')!.parentElement!)
+}
+
+async function fillHero() {
+	await typeInto(field('name'), 'hero')
+	await typeInto(field('width'), '1200')
+	await typeInto(field('height'), '630')
+	await setFormat('webp')
+	await typeInto(qualityInput(), '82')
+	await click(switchByLabel('generate-on-upload-label'))
+}
+
+async function submit(label = 'Add variant') {
+	await click(saveButton(label))
+}
+
+function saved(overrides: Record<string, unknown> = {}) {
+	return { ...variant({ name: 'hero' }), generated_files: 0, cache_size: 0, ...overrides }
+}
+
+beforeEach(() => {
+	toasts.add.mockClear()
+	localStorage.clear()
+	initializeLocale()
+	stubBrowser()
+	vi.mocked(useApi).mockReset()
+})
+
+afterEach(async () => {
+	vi.unstubAllGlobals()
+	await unmountPage()
+	localStorage.clear()
+	initializeLocale()
+})
+
+describe('Rule: Slide-over opening and closing', () => {
+	it('Add variant opens the slide-over on desktop', async () => {
+		await mountPage()
+
+		await openAddForm()
+
+		const panel = form()
+		expect(panel.className).toContain('sm:max-w-240')
+		expect(panel.querySelector('[data-slot="title"]')?.textContent?.trim()).toBe('Add variant')
+		expect(panel.querySelector('[data-slot="header"]')!.className).toContain('h-14')
+		const close = buttonByLabel('Close')!
+		expect(iconNames(close)).toContain('i-lucide-x')
+		expect(panel.querySelector('[data-slot="body"] form')!.className).toContain(
+			'sm:grid-cols-[440px_minmax(0,1fr)]',
+		)
+		expect(panel.querySelector('[data-slot="footer"]')!.className).toContain('sm:h-16')
+		expect(buttonIn(panel, 'Cancel')!.disabled).toBe(false)
+		expect(saveButton().className).toContain('sm:h-8')
+		expect(footerStatus()).toBe('')
+		expect(document.activeElement).toBe(field('name'))
+		expect(document.body.querySelector('[data-slot="overlay"]')).not.toBeNull()
+		expect(rows()).toHaveLength(6)
+	})
+
+	it('Add variant opens a full page on mobile', async () => {
+		await mountPage({ desktop: false })
+
+		await openAddForm()
+
+		const panel = form()
+		expect(buttonByLabel('Close')).toBeNull()
+		const back = buttonByLabel('Back')!
+		expect(iconNames(back)).toContain('i-lucide-arrow-left')
+		expect(panel.querySelector('[data-slot="title"]')?.textContent?.trim()).toBe('Add variant')
+		expect(panel.className).toContain('w-full')
+		expect(panel.querySelector('[data-slot="footer"]')!.className).toContain('h-18')
+		expect(buttonIn(panel, 'Cancel')!.className).toContain('flex-1')
+		expect(saveButton().className).toContain('flex-1')
+		expect(panel.textContent).toContain('Preview')
+		const sections = panel.querySelectorAll('[data-slot="body"] form > div')
+		expect(sections[1]!.className).toContain('border-t')
+	})
+
+	it('Edit opens with the stored values', async () => {
+		await mountPage()
+
+		await openEditForm('hero')
+
+		const panel = form()
+		expect(panel.querySelector('[data-slot="title"]')?.textContent?.trim()).toBe(
+			'Edit variant: hero',
+		)
+		expect(field('name')!.value).toBe('hero')
+		expect(field('name')!.readOnly).toBe(true)
+		expect(field('name')!.className).toContain('bg-elevated')
+		expect(iconNames(panel.querySelector('[data-field="name"]')!)).toContain('i-lucide-lock')
+		expect(fieldHelp('name')).toBe("The name can't be changed.")
+		expect([field('width')!.value, field('height')!.value]).toEqual(['1200', '630'])
+		expect(checkedFit()).toBe('cover')
+		expect(formatShown()).toBe('WebP')
+		expect(qualityInput()!.value).toBe('82')
+		expect(switchByLabel('generate-on-upload-label').getAttribute('aria-checked')).toBe('false')
+		expect(switchByLabel('variant-enabled-label').getAttribute('aria-checked')).toBe('true')
+		expect(textOf(panel.querySelector('[data-testid="edit-warning"]')!)).toBe(WARNING_ALERT)
+		expect(saveButton('Save changes').disabled).toBe(true)
+		expect(footerStatus()).toBe('')
+	})
+
+	it('Dismissing a pristine form closes immediately', async () => {
+		await mountPage()
+		const opener = document.body.querySelector<HTMLElement>('[data-testid="add-variant"]')!
+
+		await openAddForm()
+		await click(buttonIn(form(), 'Cancel'))
+
+		expect(slideover()).toBeNull()
+		expect(alertDialog()).toBeNull()
+		expect(document.activeElement).toBe(opener)
+	})
+
+	it('Dismissing a pristine form with the close button or Escape closes immediately', async () => {
+		await mountPage()
+
+		await openAddForm()
+		await click(buttonByLabel('Close'))
+		expect(slideover()).toBeNull()
+
+		await openAddForm()
+		await pressEscape()
+		expect(slideover()).toBeNull()
+		expect(alertDialog()).toBeNull()
+	})
+
+	it('Closing a pristine edit returns focus to the ellipsis button', async () => {
+		await mountPage()
+
+		await openEditForm('hero')
+		await click(buttonIn(form(), 'Cancel'))
+
+		await vi.waitFor(() =>
+			expect(document.activeElement).toBe(buttonByLabel('Actions for hero')),
+		)
+	})
+
+	it.each([
+		['Cancel', async () => click(buttonIn(form(), 'Cancel'))],
+		['the close button', async () => click(buttonByLabel('Close'))],
+		['Escape', async () => pressEscape()],
+	])('Dismissing a dirty form asks first: %s', async (_name, dismiss) => {
+		await mountPage()
+		await openEditForm('hero')
+		await typeInto(qualityInput(), '70')
+
+		await dismiss()
+
+		const dialog = alertDialog()!
+		expect(textOf(dialog)).toContain('Discard changes?')
+		expect(textOf(dialog)).toContain(
+			"You have unsaved changes to “hero”. If you close now, they're lost.",
+		)
+		expect(
+			Array.from(dialog.querySelectorAll('button')).map((b) => b.textContent?.trim()),
+		).toEqual(['Keep editing', 'Discard changes'])
+		expect(dialog.querySelectorAll('button')[1]!.className).toContain('bg-error')
+	})
+
+	it('Dismissing a dirty form on mobile with the back arrow asks first', async () => {
+		await mountPage({ desktop: false })
+		await openAddForm()
+		await typeInto(field('name'), 'banner')
+
+		await click(buttonByLabel('Back'))
+
+		expect(textOf(alertDialog()!)).toContain('Discard changes?')
+	})
+
+	it('Keep editing returns to the form with its values', async () => {
+		await mountPage()
+		await openAddForm()
+		await typeInto(field('name'), 'banner')
+		await click(buttonIn(form(), 'Cancel'))
+
+		await click(buttonIn(alertDialog()!, 'Keep editing'))
+
+		expect(alertDialog()).toBeNull()
+		expect(slideover()).not.toBeNull()
+		expect(field('name')!.value).toBe('banner')
+	})
+
+	it('Discard changes closes the slide-over and discards the values', async () => {
+		await mountPage()
+		await openEditForm('hero')
+		await typeInto(qualityInput(), '70')
+		await click(buttonIn(form(), 'Cancel'))
+
+		await click(buttonIn(alertDialog()!, 'Discard changes'))
+
+		expect(slideover()).toBeNull()
+		expect(alertDialog()).toBeNull()
+		expect(calls(PUT_HERO)).toHaveLength(0)
+		await openEditForm('hero')
+		expect(qualityInput()!.value).toBe('82')
+	})
+
+	it('The discard text names the new variant in create mode', async () => {
+		await mountPage()
+		await openAddForm()
+		await typeInto(field('name'), 'banner')
+		await click(buttonIn(form(), 'Cancel'))
+
+		expect(textOf(alertDialog()!)).toContain(
+			"You have unsaved changes to “banner”. If you close now, they're lost.",
+		)
+	})
+
+	it('The discard text has no name when the name is empty', async () => {
+		await mountPage()
+		await openAddForm()
+		await typeInto(field('width'), '800')
+		await click(buttonIn(form(), 'Cancel'))
+
+		expect(textOf(alertDialog()!)).toContain(
+			"You have unsaved changes. If you close now, they're lost.",
+		)
+	})
+})
+
+describe('Rule: Form states', () => {
+	it('Create: pristine', async () => {
+		await mountPage()
+
+		await openAddForm()
+
+		const panel = form()
+		expect(document.activeElement).toBe(field('name'))
+		expect(field('name')!.value).toBe('')
+		expect(field('name')!.placeholder).toBe('e.g. hero')
+		expect(fieldHelp('name')).toBe(
+			"Lowercase letters, numbers and dashes. Can't be changed later.",
+		)
+		expect([field('width')!.placeholder, field('height')!.placeholder]).toEqual([
+			'auto',
+			'auto',
+		])
+		expect(textOf(panel.querySelector('[data-field="width"]')!)).toContain('px')
+		expect(panel.textContent).toContain(DIMENSION_HELP)
+		expect(panel.querySelector('[role="radiogroup"]')).not.toBeNull()
+		expect(checkedFit()).toBe('cover')
+		expect(panel.textContent).toContain('Fills the box and crops what overflows.')
+		expect(formatShown()).toBe('Original')
+		expect(panel.textContent).toContain('Keeps the format of each source image.')
+		expect(sliderThumb().getAttribute('aria-valuenow')).toBe('80')
+		expect(qualityInput()!.value).toBe('80')
+		expect(fieldHelp('quality')).toBe('1–100. Higher is sharper and larger.')
+		expect(switchByLabel('generate-on-upload-label').getAttribute('aria-checked')).toBe('false')
+		expect(switchByLabel('variant-enabled-label').getAttribute('aria-checked')).toBe('true')
+		expect(panel.textContent).toContain('Creates this variant when an image is uploaded.')
+		expect(panel.textContent).toContain('Disabled variants return 400 on the public site.')
+		expect(saveButton().disabled).toBe(true)
+		expect(panel.textContent).toContain('Set a width or height to see a preview.')
+		expect(panel.querySelector('[data-testid="edit-warning"]')).toBeNull()
+	})
+
+	it.each([
+		['contain', 'Whole image inside the box, padded to the box size.'],
+		['inside', 'Whole image inside the box, no padding.'],
+		['cover', 'Fills the box and crops what overflows.'],
+	])('The Fit help follows the selection: %s', async (fit, help) => {
+		await mountPage()
+		await openAddForm()
+		await click(radio('inside'))
+
+		await click(radio(fit))
+
+		expect(checkedFit()).toBe(fit)
+		expect(form().textContent).toContain(help)
+	})
+
+	it('The Name counter', async () => {
+		await mountPage()
+		await openAddForm()
+
+		await typeInto(field('name'), 'hero')
+
+		expect(form().querySelector('[data-testid="name-counter"]')?.textContent).toBe('4/32')
+	})
+
+	it('Edit mode has no counter', async () => {
+		await mountPage()
+
+		await openEditForm('hero')
+
+		expect(form().querySelector('[data-testid="name-counter"]')).toBeNull()
+	})
+
+	it('Create: dirty with valid values', async () => {
+		await mountPage()
+		await openAddForm()
+
+		await fillHero()
+
+		expect(saveButton().disabled).toBe(false)
+		expect(footerStatus()).toBe('Unsaved changes')
+		expect(iconNames(form().querySelector('[data-slot="footer"]')!)).toContain(
+			'i-lucide-circle-dot',
+		)
+		expect(previewText()).toContain('hero')
+		expect(previewText()).toContain('1200×630 · about 96 KB')
+	})
+
+	it.each([
+		['name', 'Hero banner', NAME_ERROR],
+		['name', 'a', NAME_ERROR],
+		['name', 'a'.repeat(33), NAME_ERROR],
+		['width', '9000', RANGE_ERROR],
+		['width', '0', RANGE_ERROR],
+		['height', '8001', RANGE_ERROR],
+		['quality', '140', QUALITY_ERROR],
+		['quality', '0', QUALITY_ERROR],
+	])('Field errors show on blur: %s %s', async (name, value, message) => {
+		await mountPage()
+		await openAddForm()
+		const input = name === 'quality' ? qualityInput() : field(name)
+
+		await typeInto(input, value)
+		await blur(input)
+
+		expect(fieldMessage(name)).toBe(message)
+		expect(iconNames(form().querySelector(`[data-field="${name}"]`)!)).toContain(
+			'i-lucide-circle-alert',
+		)
+		expect(input!.getAttribute('aria-invalid')).toBe('true')
+		expect(input!.className).toContain('ring-error')
+		if (name === 'name') {
+			expect(fieldHelp('name')).toBeUndefined()
+		}
+	})
+
+	it('Once an error shows it is revalidated on every input and clears when valid', async () => {
+		await mountPage()
+		await openAddForm()
+		await typeInto(field('name'), 'Hero')
+		await blur(field('name'))
+		expect(fieldMessage('name')).toBe(NAME_ERROR)
+
+		await typeInto(field('name'), 'hero')
+
+		expect(fieldMessage('name')).toBeUndefined()
+		expect(fieldHelp('name')).toBe(
+			"Lowercase letters, numbers and dashes. Can't be changed later.",
+		)
+		await typeInto(field('name'), 'h')
+		expect(fieldMessage('name')).toBe(NAME_ERROR)
+	})
+
+	it.each([
+		['name', 'ab'],
+		['name', 'a-b-c'],
+		['width', '1'],
+		['height', '8000'],
+		['quality', '1'],
+		['quality', '100'],
+	])('Valid boundary values show no error: %s %s', async (name, value) => {
+		await mountPage()
+		await openAddForm()
+		const input = name === 'quality' ? qualityInput() : field(name)
+
+		await typeInto(input, value)
+		await blur(input)
+
+		expect(fieldMessage(name)).toBeUndefined()
+	})
+
+	it('Submitting with several errors sends nothing', async () => {
+		await mountPage()
+		await openAddForm()
+		await typeInto(field('name'), 'Hero banner')
+		await typeInto(field('width'), '9000')
+		await typeInto(field('height'), '630')
+		await setFormat('webp')
+		await typeInto(qualityInput(), '140')
+
+		await submit()
+
+		expect(fieldMessage('name')).toBe(NAME_ERROR)
+		expect(fieldMessage('width')).toBe(RANGE_ERROR)
+		expect(fieldMessage('quality')).toBe(QUALITY_ERROR)
+		expect(calls(CREATE)).toHaveLength(0)
+		expect(document.activeElement).toBe(field('name'))
+	})
+
+	it('No dimension', async () => {
+		await mountPage()
+		await openAddForm()
+		await typeInto(field('name'), 'banner')
+		await setFormat('webp')
+
+		await submit()
+
+		expect(fieldMessage('width')).toBe(DIMENSION_ERROR)
+		expect(fieldMessage('height')).toBeUndefined()
+		expect(field('height')!.className).toContain('ring-error')
+		expect(form().textContent).not.toContain(DIMENSION_HELP)
+		expect(calls(CREATE)).toHaveLength(0)
+		expect(document.activeElement).toBe(field('width'))
+	})
+
+	it('PNG hides Quality', async () => {
+		await mountPage({ routes: { [CREATE]: () => Promise.resolve(saved({ name: 'logo' })) } })
+		await openAddForm()
+		await typeInto(field('name'), 'logo')
+		await typeInto(field('width'), '300')
+
+		await setFormat('png')
+
+		expect(form().querySelector('[data-field="quality"]')).toBeNull()
+		expect(form().querySelector('[role="slider"]')).toBeNull()
+		expect(form().textContent).not.toContain('Higher is sharper')
+		expect(previewText()).toContain('about')
+		await submit()
+		expect('quality' in bodyOf(CREATE)).toBe(false)
+	})
+
+	it('Switching back from PNG restores the previous quality', async () => {
+		await mountPage()
+		await openAddForm()
+		await setFormat('webp')
+		await typeInto(qualityInput(), '70')
+		await setFormat('png')
+
+		await setFormat('webp')
+
+		expect(qualityInput()!.value).toBe('70')
+	})
+
+	it('The Quality slider and field stay in sync', async () => {
+		await mountPage()
+		await openAddForm()
+		await setFormat('webp')
+
+		sliderThumb().focus()
+		for (let step = 0; step < 10; step++) {
+			await pressKey(sliderThumb(), 'ArrowLeft')
+		}
+		expect(qualityInput()!.value).toBe('70')
+
+		await typeInto(qualityInput(), '90')
+		expect(sliderThumb().getAttribute('aria-valuenow')).toBe('90')
+		expect(Number.parseFloat(sliderRange().style.right)).toBeCloseTo(10, 0)
+	})
+})
+
+describe('Rule: Saving a new variant', () => {
+	it('Add sends POST with the form values', async () => {
+		await mountPage({ routes: { [CREATE]: () => Promise.resolve(saved()) } })
+		await openAddForm()
+		await fillHero()
+
+		await submit()
+
+		expect(bodyOf(CREATE)).toEqual({
+			name: 'hero',
+			width: 1200,
+			height: 630,
+			fit: 'cover',
+			format: 'webp',
+			quality: 82,
+			generate_on_upload: true,
+			enabled: true,
+		})
+	})
+
+	it('An empty Width or Height is sent as null', async () => {
+		await mountPage({ routes: { [CREATE]: () => Promise.resolve(saved({ name: 'card' })) } })
+		await openAddForm()
+		await typeInto(field('name'), 'card')
+		await typeInto(field('width'), '800')
+
+		await submit()
+
+		expect(bodyOf(CREATE).width).toBe(800)
+		expect(bodyOf(CREATE).height).toBeNull()
+	})
+
+	it('While saving, the form is locked', async () => {
+		const pending = deferred<unknown>()
+		await mountPage({ routes: { [CREATE]: () => pending.promise } })
+		await openAddForm()
+		await fillHero()
+
+		await submit()
+
+		const panel = form()
+		expect(
+			Array.from(panel.querySelectorAll<HTMLInputElement>('input:not([type="range"])')).every(
+				(input) => input.disabled,
+			),
+		).toBe(true)
+		expect(panel.querySelector('[role="radiogroup"].opacity-60')).not.toBeNull()
+		expect(
+			Array.from(panel.querySelectorAll('button[role="switch"]')).every(
+				(item) => (item as HTMLButtonElement).disabled,
+			),
+		).toBe(true)
+		expect((panel.querySelector('[role="combobox"]') as HTMLButtonElement).disabled).toBe(true)
+		expect(buttonIn(panel, 'Cancel')!.disabled).toBe(true)
+		expect(saveButton('Saving…').disabled).toBe(true)
+		expect(iconNames(saveButton('Saving…'))).toContain('i-lucide-loader-circle')
+
+		await pressEscape()
+		await click(buttonByLabel('Close'))
+		await clickBackdrop()
+		expect(slideover()).not.toBeNull()
+		expect(alertDialog()).toBeNull()
+		pending.resolve(saved())
+		await flushPromises()
+	})
+
+	it('A successful create', async () => {
+		await mountPage({
+			routes: { [CREATE]: () => Promise.resolve(saved({ name: 'banner' })) },
+		})
+		await openAddForm()
+		const opener = document.body.querySelector<HTMLElement>('[data-testid="add-variant"]')!
+		await typeInto(field('name'), 'banner')
+		await typeInto(field('width'), '1200')
+
+		await submit()
+
+		expect(slideover()).toBeNull()
+		expect(rows().map((row) => textOf(row).split(' ')[0])).toEqual([
+			'banner',
+			'card',
+			'hero',
+			'og',
+			'print',
+			'square',
+			'thumb',
+		])
+		expect(textOf(rows()[0]!)).toContain('0 0 KB')
+		expect(
+			document.body.querySelector('[data-testid="variants-summary"]')?.textContent?.trim(),
+		).toBe('7 variants · 1,284 generated files · 212 MB')
+		expect(calls(LIST)).toHaveLength(1)
+		expect(toastCalls(toasts)).toEqual([
+			{ title: 'Variant “banner” added', description: undefined, color: 'success' },
+		])
+		await vi.waitFor(() => expect(document.activeElement).toBe(opener))
+	})
+
+	it('A create from the empty state leaves the empty state', async () => {
+		await mountPage({
+			routes: {
+				[LIST]: () => Promise.resolve({ items: [] }),
+				[CREATE]: () => Promise.resolve(saved({ name: 'thumb' })),
+			},
+		})
+		await click(findButton('Add variant'))
+		await typeInto(field('name'), 'thumb')
+		await typeInto(field('width'), '400')
+
+		await submit()
+
+		expect(rows()).toHaveLength(1)
+		expect(
+			document.body.querySelector('[data-testid="variants-summary"]')?.textContent?.trim(),
+		).toBe('1 variant · 0 generated files · 0 KB')
+		expect(document.body.textContent).not.toContain('No variants yet')
+	})
+
+	it('Name already taken (409)', async () => {
+		await mountPage({
+			routes: {
+				[CREATE]: () =>
+					Promise.reject(
+						new ApiError(
+							409,
+							undefined,
+							'A variant named “thumb” already exists. Choose another name.',
+						),
+					),
+			},
+		})
+		await openAddForm()
+		await typeInto(field('name'), 'thumb')
+		await typeInto(field('width'), '400')
+		field('width')!.focus()
+
+		await submit()
+
+		expect(slideover()).not.toBeNull()
+		expect(fieldMessage('name')).toBe(
+			'A variant named “thumb” already exists. Choose another name.',
+		)
+		expect(field('name')!.className).toContain('ring-error')
+		expect([field('name')!.value, field('width')!.value]).toEqual(['thumb', '400'])
+		expect(document.activeElement).toBe(field('name'))
+		expect(field('name')!.disabled).toBe(false)
+		expect(form().querySelector('[role="alert"]')).toBeNull()
+		expect(toasts.add).not.toHaveBeenCalled()
+
+		await typeInto(field('name'), 'thumb2')
+		expect(fieldMessage('name')).toBeUndefined()
+	})
+
+	it.each([
+		['status 500', () => Promise.reject(new ApiError(500, undefined, 'boom'))],
+		['a network failure', () => Promise.reject(new NetworkError())],
+	])('Save error: %s', async (_name, failure) => {
+		let attempt = 0
+		await mountPage({
+			routes: {
+				[CREATE]: () => (++attempt === 1 ? failure() : Promise.resolve(saved())),
+			},
+		})
+		await openAddForm()
+		await fillHero()
+
+		await submit()
+
+		expect(slideover()).not.toBeNull()
+		expect(field('name')!.value).toBe('hero')
+		expect(field('name')!.disabled).toBe(false)
+		const alert = form().querySelector<HTMLElement>('[role="alert"]')!
+		expect(textOf(alert)).toContain(SAVE_ERROR_TITLE)
+		expect(textOf(alert)).toContain('Check your connection and try again.')
+		expect(textOf(alert)).not.toContain('boom')
+		expect(
+			form().querySelector('[data-slot="body"] form')!.firstElementChild!.contains(alert),
+		).toBe(true)
+
+		await click(buttonIn(alert, 'Try again'))
+
+		expect(calls(CREATE)).toHaveLength(2)
+		expect(bodyOf(CREATE, 1)).toEqual(bodyOf(CREATE, 0))
+		expect(form()?.querySelector('[role="alert"]') ?? null).toBeNull()
+		expect(slideover()).toBeNull()
+	})
+
+	it('Try again removes the alert as soon as the request starts', async () => {
+		const retry = deferred<unknown>()
+		let attempt = 0
+		await mountPage({
+			routes: {
+				[CREATE]: () =>
+					++attempt === 1 ? Promise.reject(new ApiError(500)) : retry.promise,
+			},
+		})
+		await openAddForm()
+		await fillHero()
+		await submit()
+
+		await click(buttonIn(form().querySelector('[role="alert"]')!, 'Try again'))
+
+		expect(form().querySelector('[role="alert"]')).toBeNull()
+		retry.resolve(saved())
+		await flushPromises()
+	})
+
+	it.each([
+		[
+			400,
+			'Check the request',
+			"A value in the request isn't valid. Reload the page and try again.",
+		],
+		[403, "You don't have access", 'Only admins can manage image variants.'],
+		[404, 'Not found', 'This variant or image no longer exists. Refresh the page.'],
+	])('Other statuses on save: %s', async (status, title, text) => {
+		await mountPage({ routes: { [CREATE]: () => Promise.reject(new ApiError(status)) } })
+		await openAddForm()
+		await fillHero()
+
+		await submit()
+
+		expect(slideover()).not.toBeNull()
+		expect(field('name')!.value).toBe('hero')
+		expect(toastCalls(toasts)).toEqual([{ title, description: text, color: 'error' }])
+	})
+
+	it.each([
+		[NAME_ERROR, 'name', NAME_ERROR],
+		[
+			'Width and height must be between 1 and 8000, and one of them is required.',
+			'width',
+			DIMENSION_ERROR,
+		],
+		['Quality must be between 1 and 100.', 'quality', QUALITY_ERROR],
+	])('A 422 from the server is shown inline: %s', async (serverText, fieldName, inline) => {
+		await mountPage({
+			routes: { [CREATE]: () => Promise.reject(new ApiError(422, undefined, serverText)) },
+		})
+		await openAddForm()
+		await fillHero()
+
+		await submit()
+
+		expect(fieldMessage(fieldName)).toBe(inline)
+		expect(form().querySelector('[role="alert"]')).toBeNull()
+	})
+
+	it('A 422 about the fit shows the save error alert', async () => {
+		await mountPage({
+			routes: {
+				[CREATE]: () =>
+					Promise.reject(
+						new ApiError(422, undefined, 'Fit must be cover, contain or inside.'),
+					),
+			},
+		})
+		await openAddForm()
+		await fillHero()
+
+		await submit()
+
+		expect(textOf(form().querySelector('[role="alert"]')!)).toContain(SAVE_ERROR_TITLE)
+	})
+})
+
+describe('Rule: Saving an edit', () => {
+	it('Edit: dirty', async () => {
+		await mountPage()
+		await openEditForm('hero')
+		expect(previewText()).toContain('1200×630 · about 96 KB')
+
+		await typeInto(qualityInput(), '70')
+
+		expect(saveButton('Save changes').disabled).toBe(false)
+		expect(footerStatus()).toBe('Unsaved changes')
+		expect(qualityInput()!.value).toBe('70')
+		expect(previewText()).toContain('1200×630 · about 71 KB')
+		expect(form().querySelector('[data-testid="edit-warning"]')).not.toBeNull()
+	})
+
+	it('Save sends PUT with the complete definition and a successful edit reports the purge', async () => {
+		await mountPage({
+			routes: {
+				[PUT_HERO]: () =>
+					Promise.resolve({
+						...variant({ quality: 70, generated_files: 0, cache_size: 0 }),
+						purged_files: 244,
+					}),
+			},
+		})
+		await openEditForm('hero')
+		await typeInto(qualityInput(), '70')
+
+		await submit('Save changes')
+
+		expect(bodyOf(PUT_HERO)).toEqual({
+			width: 1200,
+			height: 630,
+			fit: 'cover',
+			format: 'webp',
+			quality: 70,
+			generate_on_upload: false,
+			enabled: true,
+		})
+		expect(slideover()).toBeNull()
+		const hero = rows().find((row) => textOf(row).startsWith('hero'))!
+		expect(textOf(hero)).toBe('hero 1200×630 cover WebP 70 0 0 KB Enabled')
+		expect(calls(LIST)).toHaveLength(1)
+		expect(toastCalls(toasts)).toEqual([
+			{
+				title: 'Variant “hero” saved. 244 files purged.',
+				description: undefined,
+				color: 'success',
+			},
+		])
+	})
+
+	it('A switch-only edit says nothing about purging', async () => {
+		await mountPage({
+			routes: {
+				[PUT_HERO]: () =>
+					Promise.resolve({ ...variant({ generate_on_upload: true }), purged_files: 0 }),
+			},
+		})
+		await openEditForm('hero')
+		await click(switchByLabel('generate-on-upload-label'))
+
+		await submit('Save changes')
+
+		expect(bodyOf(PUT_HERO).generate_on_upload).toBe(true)
+		expect(toastCalls(toasts)).toEqual([
+			{ title: 'Variant “hero” saved.', description: undefined, color: 'success' },
+		])
+	})
+
+	it('Saving while saving and the save error behave as in create', async () => {
+		const pending = deferred<unknown>()
+		await mountPage({ routes: { [PUT_HERO]: () => pending.promise } })
+		await openEditForm('hero')
+		await typeInto(qualityInput(), '70')
+
+		await submit('Save changes')
+
+		expect(saveButton('Saving…').disabled).toBe(true)
+		expect(buttonIn(form(), 'Cancel')!.disabled).toBe(true)
+		await pressEscape()
+		expect(slideover()).not.toBeNull()
+		pending.reject(new ApiError(500))
+		await flushPromises()
+		expect(textOf(form().querySelector('[role="alert"]')!)).toContain(SAVE_ERROR_TITLE)
+		expect(qualityInput()!.value).toBe('70')
+	})
+})
+
+describe('Rule: Preview and ImageCompare', () => {
+	async function openHero() {
+		await mountPage()
+		await openAddForm()
+		await typeInto(field('name'), 'hero')
+		await typeInto(field('width'), '1200')
+		await typeInto(field('height'), '630')
+		await setFormat('webp')
+		await typeInto(qualityInput(), '82')
+	}
+
+	it('Preview layout', async () => {
+		await openHero()
+
+		const panel = form()
+		expect(panel.querySelector('h3')?.textContent).toBe('Preview')
+		expect(panel.textContent).toContain('Sample: north-wall.jpg')
+		const box = panel.querySelector('[data-testid="image-compare"]')!
+		expect(box.className).toContain('aspect-3/2')
+		expect(box.className).toContain('border')
+		expect(box.className).toContain('overflow-hidden')
+		const labels = box.nextElementSibling!
+		expect(textOf(labels)).toBe('Original 4032 × 3024 · 3.9 MB hero 1200×630 · about 96 KB')
+		expect(panel.textContent).toContain(
+			'Drag the divider, or focus it and use the arrow keys. The estimate comes from a sample; output is never larger than the source.',
+		)
+	})
+
+	it('Compare box content', async () => {
+		await openHero()
+
+		const box = form().querySelector<HTMLElement>('[data-testid="image-compare"]')!
+		expect(
+			box.querySelector<HTMLElement>('[data-testid="compare-variant"]')!.style.clipPath,
+		).toBe('inset(0 0 0 50%)')
+		const chips = Array.from(box.querySelectorAll('span.absolute.top-2'))
+		expect(chips.map((chip) => chip.textContent?.trim())).toEqual(['Original', 'hero'])
+		expect(chips[0]!.className).toContain('left-2')
+		expect(chips[1]!.className).toContain('right-2')
+		expect(chips[1]!.className).toContain('font-mono')
+		expect(box.querySelector<HTMLElement>('[data-testid="compare-divider"]')!.style.left).toBe(
+			'50%',
+		)
+		expect(box.querySelector('[data-testid="compare-divider"]')!.className).toContain('w-0.5')
+		const handle = box.querySelector<HTMLElement>('[data-testid="compare-handle"]')!
+		expect(handle.className).toContain('size-8')
+		expect(handle.className).toContain('max-sm:size-11')
+		expect(iconNames(handle)).toContain('i-lucide-chevrons-left-right')
+	})
+
+	it('ImageCompare is a native range input', async () => {
+		await openHero()
+
+		const input = compareInput()
+		expect(input.type).toBe('range')
+		expect([input.min, input.max, input.step, input.value]).toEqual(['0', '100', '1', '50'])
+		expect(input.getAttribute('aria-label')).toBe('Compare original and hero')
+		expect(input.getAttribute('aria-valuetext')).toBe('50% hero')
+		expect(input.getAttribute('aria-valuenow')).toBe('50')
+	})
+
+	it.each([
+		[50, 'ArrowRight', {}, 51],
+		[50, 'ArrowUp', {}, 51],
+		[50, 'ArrowLeft', {}, 49],
+		[50, 'ArrowDown', {}, 49],
+		[50, 'ArrowRight', { shiftKey: true }, 60],
+		[50, 'ArrowLeft', { shiftKey: true }, 40],
+		[50, 'Home', {}, 0],
+		[50, 'End', {}, 100],
+		[100, 'ArrowRight', {}, 100],
+		[0, 'ArrowLeft', {}, 0],
+		[95, 'ArrowRight', { shiftKey: true }, 100],
+		[5, 'ArrowLeft', { shiftKey: true }, 0],
+	])('Keyboard behaviour: from %s press %s %j gives %s', async (start, key, init, end) => {
+		await openHero()
+		const input = compareInput()
+		input.value = String(start)
+		input.dispatchEvent(new Event('input', { bubbles: true }))
+		await flushPromises()
+		input.focus()
+
+		await pressKey(input, key, init)
+
+		expect(compareInput().value).toBe(String(end))
+		expect(compareInput().getAttribute('aria-valuetext')).toBe(`${end}% hero`)
+		expect(
+			form().querySelector<HTMLElement>('[data-testid="compare-divider"]')!.style.left,
+		).toBe(`${end}%`)
+		expect(
+			form().querySelector<HTMLElement>('[data-testid="compare-variant"]')!.style.clipPath,
+		).toBe(`inset(0 0 0 ${end}%)`)
+	})
+
+	it('Focus ring and the slider keeps its value when the form fields change', async () => {
+		await openHero()
+		const handle = form().querySelector<HTMLElement>('[data-testid="compare-handle"]')!
+		expect(handle.className).toContain('peer-focus-visible:outline-2')
+		expect(handle.className).toContain('peer-focus-visible:outline-offset-2')
+		expect(handle.className).toContain('peer-focus-visible:outline-primary')
+		expect(compareInput().className).toContain('peer')
+		await pressKey(compareInput(), 'End')
+
+		await typeInto(field('width'), '800')
+
+		expect(compareInput().value).toBe('100')
+	})
+
+	it('Pointer dragging', async () => {
+		await openHero()
+		const input = compareInput()
+
+		input.value = '75'
+		input.dispatchEvent(new Event('input', { bubbles: true }))
+		await flushPromises()
+
+		expect(input.getAttribute('aria-valuetext')).toBe('75% hero')
+		expect(
+			form().querySelector<HTMLElement>('[data-testid="compare-divider"]')!.style.left,
+		).toBe('75%')
+	})
+
+	it('No dimension, no comparison', async () => {
+		await mountPage()
+		await openAddForm()
+
+		const box = form().querySelector<HTMLElement>('[data-testid="image-compare"]')!
+		expect(box.querySelector('[data-testid="compare-variant"]')).toBeNull()
+		expect(box.querySelector('[data-testid="compare-divider"]')).toBeNull()
+		expect(box.querySelector('[data-testid="compare-handle"]')).toBeNull()
+		expect(box.querySelector('input[type="range"]')).toBeNull()
+		expect(Array.from(box.querySelectorAll('span.absolute.top-2')).map(textOf)).toEqual([
+			'Original',
+		])
+		const overlay = box.querySelector('p')!
+		expect(overlay.textContent).toBe('Set a width or height to see a preview.')
+		expect(overlay.className).toContain('right-3')
+		expect(overlay.className).toContain('bottom-3')
+		expect(overlay.className).toContain('left-3')
+		expect(textOf(box.nextElementSibling!)).toBe(
+			'Original 4032 × 3024 · 3.9 MB name No output yet',
+		)
+	})
+
+	it('The sample name and slider labels follow the name', async () => {
+		await mountPage()
+		await openAddForm()
+
+		await typeInto(field('width'), '800')
+
+		expect(compareInput().getAttribute('aria-label')).toBe('Compare original and name')
+		expect(previewText()).toContain('name 800×600 · about')
+		expect(
+			Array.from(form().querySelectorAll('span.absolute.top-2')).map(
+				(chip) => chip.textContent,
+			),
+		).toEqual(['Original', 'name'])
+	})
+
+	it('The estimate follows quality and format', async () => {
+		await openHero()
+		const labels: string[] = []
+		for (const quality of ['30', '60', '90']) {
+			await typeInto(qualityInput(), quality)
+			labels.push(previewText().match(/about (\d+) KB/)![1]!)
+		}
+
+		expect(labels.map(Number)).toEqual([...labels.map(Number)].sort((a, b) => a - b))
+		await setFormat('png')
+		expect(previewText()).toContain('1200×630 · about 310 KB')
+	})
+})
+
+describe('Rule: URL and copy', () => {
+	it('The URL row', async () => {
+		await mountPage()
+		await openAddForm()
+
+		await typeInto(field('name'), 'hero')
+
+		const url = form().querySelector('[data-testid="variant-url"]')!
+		expect(url.textContent?.trim()).toBe(`${URL_PREFIX}hero`)
+		expect(url.className).toContain('font-mono')
+		expect(url.className).toContain('bg-elevated')
+		expect(url.className).toContain('text-highlighted')
+		const copy = buttonIn(form(), 'Copy')!
+		expect(copy.disabled).toBe(false)
+		expect(iconNames(copy)).toContain('i-lucide-copy')
+	})
+
+	it('Without a name', async () => {
+		await mountPage()
+		await openAddForm()
+
+		const url = form().querySelector('[data-testid="variant-url"]')!
+		expect(url.textContent?.trim()).toBe(`${URL_PREFIX}<name>`)
+		expect(url.className).toContain('text-muted')
+		expect(buttonIn(form(), 'Copy')!.disabled).toBe(true)
+	})
+
+	it('Copy writes the URL, shows Copied, then returns to Copy', async () => {
+		const writeText = stubClipboard()
+		await mountPage()
+		await openAddForm()
+		await typeInto(field('name'), 'hero')
+		vi.useFakeTimers({ toFake: ['setTimeout', 'clearTimeout'] })
+
+		await click(buttonIn(form(), 'Copy'))
+
+		expect(writeText).toHaveBeenCalledWith(`${URL_PREFIX}hero`)
+		const copied = buttonIn(form(), 'Copied')!
+		expect(copied.textContent).toContain('Copied')
+		expect(iconNames(copied)).toContain('i-lucide-check')
+		vi.advanceTimersByTime(2500)
+		await flushPromises()
+		expect(buttonIn(form(), 'Copied')).toBeUndefined()
+		expect(iconNames(buttonIn(form(), 'Copy')!)).toContain('i-lucide-copy')
+	})
+
+	it('A clipboard failure does not claim success', async () => {
+		const writeText = stubClipboard()
+		writeText.mockRejectedValue(new Error('denied'))
+		await mountPage()
+		await openAddForm()
+		await typeInto(field('name'), 'hero')
+
+		await click(buttonIn(form(), 'Copy'))
+
+		expect(buttonIn(form(), 'Copy')!.textContent).toContain('Copy')
+		expect(buttonIn(form(), 'Copied')).toBeUndefined()
+		expect(form().querySelector('[role="alert"]')).toBeNull()
+		expect(toasts.add).not.toHaveBeenCalled()
+	})
+
+	it('In edit mode the URL uses the locked name', async () => {
+		await mountPage()
+		await openEditForm('hero')
+
+		expect(form().querySelector('[data-testid="variant-url"]')!.textContent?.trim()).toBe(
+			`${URL_PREFIX}hero`,
+		)
+		expect(buttonIn(form(), 'Copy')!.disabled).toBe(false)
+	})
+})
+
+describe('Rule: Menu keyboard behaviour', () => {
+	it('arrow keys move between items and Enter activates the focused item', async () => {
+		await mountPage()
+		const trigger = buttonByLabel('Actions for hero')!
+		trigger.focus()
+		await click(trigger)
+		const menu = document.body.querySelector<HTMLElement>('[role="menu"]')!
+
+		await pressKey(menu, 'ArrowDown')
+		const first = document.activeElement as HTMLElement
+		await pressKey(first, 'ArrowDown')
+		const second = document.activeElement as HTMLElement
+		await pressKey(second, 'ArrowUp')
+
+		expect(first.textContent?.trim()).toBe('Edit')
+		expect(second.textContent?.trim()).toBe('Purge cache')
+		expect((document.activeElement as HTMLElement).textContent?.trim()).toBe('Edit')
+		await pressKey(document.activeElement!, 'Enter')
+		expect(menuItem('Edit') ?? null).toBeNull()
+		expect(slideover()?.textContent).toContain('Edit variant: hero')
+		await openMenu('card')
+	})
+})
+
+describe('Rule: French strings on the form', () => {
+	it('renders the form in French', async () => {
+		setLocale('fr')
+		await mountPage()
+
+		await click(buttonByLabel('Actions pour hero'))
+		await click(menuItem('Modifier'))
+
+		const text = form().textContent!
+		expect(form().querySelector('[data-slot="title"]')?.textContent?.trim()).toBe(
+			'Modifier la variante : hero',
+		)
+		for (const french of [
+			'Aperçu',
+			'Ajustement',
+			'Qualité',
+			'Générer à l’import',
+			'Enregistrer les modifications',
+			'Annuler',
+			'Copier',
+		]) {
+			expect(text).toContain(french)
+		}
+		for (const english of [
+			'Preview',
+			'Quality',
+			'Save changes',
+			'Cancel',
+			'Generate on upload',
+			'Enabled',
+			'Copy',
+			'Drag the divider',
+		]) {
+			expect(text).not.toContain(english)
+		}
+		expect(defaultFixture()).toHaveLength(6)
+	})
+})
diff --git a/web/src/views/__tests__/VariantsPage.spec.ts b/web/src/views/__tests__/VariantsPage.spec.ts
new file mode 100644
index 0000000..84db948
--- /dev/null
+++ b/web/src/views/__tests__/VariantsPage.spec.ts
@@ -0,0 +1,933 @@
+import { afterEach, beforeEach, describe, expect, it, vi } from 'vitest'
+import { flushPromises } from '@vue/test-utils'
+import UButton from '@nuxt/ui/components/Button.vue'
+import UIcon from '@nuxt/ui/components/Icon.vue'
+import router from '@/router'
+import { ApiError, NetworkError, useApi } from '@/composables/useApi'
+import { initializeLocale } from '@/i18n'
+import {
+	LIST,
+	MB,
+	alertDialog,
+	buttonByLabel,
+	buttonIn,
+	calls,
+	click,
+	defaultFixture,
+	deferred,
+	findButton,
+	menuItem,
+	mountPage,
+	pageTitle,
+	openMenu,
+	pressEscape,
+	rowOf,
+	rows,
+	stubBrowser,
+	textOf,
+	toastCalls,
+	unmountPage,
+	variant,
+	variantsTable,
+	wrapper,
+} from './variantsTestKit'
+
+vi.mock('@/composables/useApi', async (importOriginal) => {
+	const actual = await importOriginal<typeof import('@/composables/useApi')>()
+	return { ...actual, useApi: vi.fn() }
+})
+
+const toasts = vi.hoisted(() => ({ add: vi.fn() }))
+
+vi.mock('@nuxt/ui/composables', async (importOriginal) => {
+	const actual = await importOriginal<typeof import('@nuxt/ui/composables')>()
+	return { ...actual, useToast: () => toasts }
+})
+
+const FORBIDDEN_TEXT =
+	'Only admins can manage image variants. Ask an admin if you need one changed.'
+const FOOTER = '6 variants · 1,284 generated files · 212 MB'
+const SERVER_TEXT =
+	"The server couldn't finish. Try again. If it keeps happening, check the server log."
+const NOT_FOUND_TEXT = 'This variant or image no longer exists. Refresh the page.'
+const PATCH_HERO = 'PATCH /v1/image-variants/hero'
+const PATCH_PRINT = 'PATCH /v1/image-variants/print'
+const PURGE_HERO = 'POST /v1/image-variants/hero/purge'
+const DELETE_HERO = 'DELETE /v1/image-variants/hero'
+
+function summary() {
+	return document.body.querySelector('[data-testid="variants-summary"]')?.textContent?.trim()
+}
+
+function iconNames(root: ParentNode) {
+	return wrapper!
+		.findAllComponents(UIcon)
+		.filter((icon) => root.contains(icon.element))
+		.map((icon) => icon.props('name'))
+}
+
+function iconOf(button: HTMLElement) {
+	return wrapper!
+		.findAllComponents(UButton)
+		.find((component) => component.element === button)
+		?.props('icon')
+}
+
+function switchOf(name: string) {
+	return document.body.querySelector<HTMLButtonElement>(
+		`button[role="switch"][aria-label="Enable variant ${name}"]`,
+	)!
+}
+
+function statusOf(name: string) {
+	return textOf(rowOf(name)).match(/(Enabled|Disabled|Purging…)/)?.[1]
+}
+
+function expectForbidden() {
+	expect(document.body.textContent).toContain("You don't have access")
+	expect(document.body.textContent).toContain(FORBIDDEN_TEXT)
+	expect(findButton('Back to Home')!.disabled).toBe(false)
+	expect(pageTitle()).toBeNull()
+	expect(document.body.querySelector('[role="tablist"]')).toBeNull()
+	expect(variantsTable()).toBeUndefined()
+	expect(document.body.querySelector('[data-testid="variant-card"]')).toBeNull()
+	expect(document.body.querySelector('[data-testid="request-reference"]')).toBeNull()
+	expect(findButton('Add variant')).toBeUndefined()
+	expect(document.body.querySelector('nav[aria-label="Main"] [aria-current="page"]')).toBeNull()
+}
+
+beforeEach(() => {
+	toasts.add.mockClear()
+	localStorage.clear()
+	initializeLocale()
+	stubBrowser()
+	vi.mocked(useApi).mockReset()
+})
+
+afterEach(async () => {
+	vi.unstubAllGlobals()
+	await unmountPage()
+	localStorage.clear()
+	initializeLocale()
+})
+
+describe('Rule: Only admins and owners see the page', () => {
+	it('A session whose role is not owner or admin gets the Forbidden state: no role', async () => {
+		await mountPage({ role: null })
+
+		expectForbidden()
+		expect(calls(LIST)).toHaveLength(0)
+		expect(iconNames(document.body)).toContain('i-lucide-lock')
+		const back = findButton('Back to Home')!
+		expect(iconOf(back)).toBe('i-lucide-arrow-left')
+	})
+
+	it('A session whose role is not owner or admin gets the Forbidden state: owner answered 403', async () => {
+		await mountPage({ routes: { [LIST]: () => Promise.reject(new ApiError(403)) } })
+
+		expectForbidden()
+		expect(calls(LIST)).toHaveLength(1)
+	})
+
+	it('Back to Home leaves the page', async () => {
+		await mountPage({ role: null })
+
+		await click(findButton('Back to Home'))
+
+		await vi.waitFor(() => expect(router.currentRoute.value.path).toBe('/home'))
+	})
+
+	it.each(['owner', 'admin'])('An owner or an admin sees the list: %s', async (role) => {
+		await mountPage({ role })
+
+		expect(calls(LIST)).toHaveLength(1)
+		expect(pageTitle()?.textContent).toBe('Image variants')
+		expect(
+			document.body.querySelector('nav[aria-label="Main"] [aria-current="page"]')
+				?.textContent,
+		).toContain('Variants')
+	})
+})
+
+describe('Rule: Header and tabs', () => {
+	it('The page header and the tabs', async () => {
+		await mountPage()
+
+		expect(pageTitle()?.textContent).toBe('Image variants')
+		expect(document.body.textContent).toContain(
+			'Named sizes and formats generated from your original images. Originals are never changed.',
+		)
+		const add = findButton('Add variant')!
+		expect(iconOf(add)).toBe('i-lucide-plus')
+		const tabs = Array.from(document.body.querySelectorAll<HTMLElement>('[role="tab"]'))
+		expect(tabs.map((tab) => tab.textContent?.trim())).toEqual(['Variants', 'Cache'])
+		expect(tabs[0]!.getAttribute('aria-selected')).toBe('true')
+		expect(tabs[0]!.className).toContain('border-primary')
+		expect(tabs[0]!.className).toContain('font-medium')
+		expect(iconOf(tabs[0]!)).toBe('i-lucide-layers')
+		expect(iconOf(tabs[1]!)).toBe('i-lucide-database')
+		expect(tabs[1]!.getAttribute('aria-disabled')).toBe('true')
+		expect(tabs[1]!.className).toContain('text-toned')
+	})
+
+	it('Activating Cache changes nothing', async () => {
+		await mountPage()
+		const before = router.currentRoute.value.fullPath
+		const cache = document.body.querySelectorAll<HTMLElement>('[role="tab"]')[1]!
+
+		await click(cache)
+
+		expect(router.currentRoute.value.fullPath).toBe(before)
+		expect(cache.getAttribute('aria-selected')).toBe('false')
+		expect(calls(LIST)).toHaveLength(1)
+	})
+
+	it('The desktop breadcrumb reads Settings, Media, Variants', async () => {
+		await mountPage()
+
+		const items = Array.from(
+			document.body.querySelectorAll('nav[aria-label="breadcrumb"] li'),
+		).map((item) => item.textContent?.trim())
+		expect(items.filter(Boolean)).toEqual(['Settings', 'Media', 'Variants'])
+	})
+
+	it('The mobile top bar title is Variants', async () => {
+		await mountPage({ desktop: false })
+
+		expect(
+			document.body.querySelector('header h1, [data-slot="title"]')?.textContent,
+		).toContain('Variants')
+	})
+
+	it('The Add variant button sits below the description on mobile', async () => {
+		await mountPage({ desktop: false })
+
+		const add = findButton('Add variant')!
+		expect(add.className).toContain('h-11')
+		expect(add.parentElement!.className).toContain('flex-col')
+	})
+})
+
+describe('Rule: Loaded, table on desktop and cards on mobile', () => {
+	it('Desktop table', async () => {
+		await mountPage()
+
+		const headers = Array.from(variantsTable()!.querySelectorAll('thead th')).map((cell) =>
+			cell.textContent?.trim(),
+		)
+		expect(headers).toEqual([
+			'Name',
+			'Dimensions',
+			'Fit',
+			'Format',
+			'Quality',
+			'Generated',
+			'Cache size',
+			'Status',
+			'',
+		])
+		expect(rows().map(textOf)).toEqual([
+			'card 800 × auto inside WebP 80 318 58 MB Enabled',
+			'hero 1200×630 cover WebP 82 244 84 MB Enabled',
+			'og 1200×630 cover JPEG 80 96 9 MB Enabled',
+			'print auto × 2400 inside PNG — 74 21 MB Disabled',
+			'square 600×600 cover JPEG 85 140 19 MB Enabled',
+			'thumb 400×300 cover WebP 80 412 21 MB Enabled',
+		])
+		expect(summary()).toBe(FOOTER)
+		expect(document.body.querySelector('[data-testid="request-reference"]')).not.toBeNull()
+	})
+
+	it('The name and dimensions cells are IBM Plex Mono and the disabled row is muted', async () => {
+		await mountPage()
+
+		const cells = rowOf('hero').querySelectorAll('td')
+		expect(cells[0]!.querySelector('span')!.className).toContain('font-mono')
+		expect(cells[0]!.querySelector('span')!.className).toContain('font-medium')
+		expect(cells[1]!.querySelector('span')!.className).toContain('font-mono')
+		expect(rowOf('print').className).toContain('text-muted')
+		expect(rowOf('hero').className).toContain('text-default')
+	})
+
+	it('Mobile cards', async () => {
+		await mountPage({ desktop: false })
+
+		const cards = rows()
+		expect(cards).toHaveLength(6)
+		expect(textOf(rowOf('hero'))).toBe(
+			'hero Enabled 1200×630 · cover · WebP · q82 244 generated · 84 MB',
+		)
+		expect(textOf(rowOf('print'))).toContain('auto × 2400 · inside · PNG ')
+		expect(textOf(rowOf('print'))).not.toContain('q')
+		expect(summary()).toBe(FOOTER)
+		const footer = document.body.querySelector('[data-testid="variants-summary"]')!
+		const reference = document.body.querySelector('[data-testid="request-reference"]')!
+		expect(cards[5]!.compareDocumentPosition(footer) & Node.DOCUMENT_POSITION_FOLLOWING).toBe(
+			Node.DOCUMENT_POSITION_FOLLOWING,
+		)
+		expect(footer.compareDocumentPosition(reference) & Node.DOCUMENT_POSITION_FOLLOWING).toBe(
+			Node.DOCUMENT_POSITION_FOLLOWING,
+		)
+	})
+
+	it('Singular footer', async () => {
+		await mountPage({
+			routes: {
+				[LIST]: () =>
+					Promise.resolve({
+						items: [
+							variant({ name: 'thumb', generated_files: 1, cache_size: 18 * 1024 }),
+						],
+					}),
+			},
+		})
+
+		expect(summary()).toBe('1 variant · 1 generated file · 18 KB')
+	})
+
+	it('Footer sums are computed from the list', async () => {
+		await mountPage()
+
+		expect(summary()).toBe(FOOTER)
+	})
+})
+
+describe('Rule: Loading', () => {
+	it('Skeletons appear only after 150 ms', async () => {
+		vi.useFakeTimers({ toFake: ['setTimeout', 'clearTimeout'] })
+		await mountPage({ routes: { [LIST]: () => new Promise(() => undefined) } })
+
+		vi.advanceTimersByTime(149)
+		await flushPromises()
+		expect(document.body.querySelector('[aria-busy="true"]')).toBeNull()
+		expect(pageTitle()?.textContent).toBe('Image variants')
+		expect(document.body.querySelector('[role="tablist"]')).not.toBeNull()
+
+		vi.advanceTimersByTime(1)
+		await flushPromises()
+		const region = document.body.querySelector('section[aria-busy="true"]')!
+		expect(region.getAttribute('aria-label')).toBe('Loading variants')
+		expect(region.querySelectorAll('.h-12')).toHaveLength(5)
+		expect(region.querySelectorAll('.h-9')).toHaveLength(1)
+		expect(region.querySelectorAll('.h-12 [class*="animate-pulse"]')).toHaveLength(30)
+		expect(textOf(region)).toBe('')
+	})
+
+	it('Skeleton cards on mobile hold three bars', async () => {
+		vi.useFakeTimers({ toFake: ['setTimeout', 'clearTimeout'] })
+		await mountPage({ desktop: false, routes: { [LIST]: () => new Promise(() => undefined) } })
+
+		vi.advanceTimersByTime(150)
+		await flushPromises()
+		const cards = document.body.querySelectorAll('section[aria-busy="true"] > div > div')
+		expect(cards).toHaveLength(4)
+		expect(
+			Array.from(cards[0]!.children).map(
+				(bar) => (bar as HTMLElement).className.match(/w-\[\d+%\]/)?.[0],
+			),
+		).toEqual(['w-[40%]', 'w-[70%]', 'w-[55%]'])
+	})
+
+	it('A fast answer never flashes skeletons', async () => {
+		vi.useFakeTimers({ toFake: ['setTimeout', 'clearTimeout'] })
+		const pending = deferred<unknown>()
+		await mountPage({ routes: { [LIST]: () => pending.promise } })
+
+		vi.advanceTimersByTime(100)
+		pending.resolve({ items: defaultFixture() })
+		await flushPromises()
+		vi.advanceTimersByTime(500)
+		await flushPromises()
+
+		expect(document.body.querySelector('[aria-busy="true"]')).toBeNull()
+		expect(rows()).toHaveLength(6)
+	})
+})
+
+describe('Rule: Empty', () => {
+	const emptyRoutes = { [LIST]: () => Promise.resolve({ items: [] }) }
+
+	it('No variants', async () => {
+		await mountPage({ routes: emptyRoutes })
+
+		expect(pageTitle()?.textContent).toBe('Image variants')
+		expect(document.body.querySelector('[role="tablist"]')).not.toBeNull()
+		expect(document.body.textContent).toContain('No variants yet')
+		expect(document.body.textContent).toContain(
+			'A variant is a named size that an image can be requested in, like ?v=thumb. Start with one of these.',
+		)
+		expect(iconNames(document.body)).toContain('i-lucide-layers')
+		const templates = Array.from(document.body.querySelectorAll('button')).filter((button) =>
+			button.textContent?.includes('Use template'),
+		)
+		expect(templates.map(textOf)).toEqual([
+			'thumb 400×300 · cover · WebP Use template',
+			'hero 1200×630 · cover · WebP Use template',
+		])
+		expect(templates.map((button) => button.className.includes('min-h-16'))).toEqual([
+			true,
+			true,
+		])
+		const adds = Array.from(document.body.querySelectorAll('button')).filter(
+			(button) => button.textContent?.trim() === 'Add variant',
+		)
+		expect(adds).toHaveLength(2)
+		expect(variantsTable()).toBeUndefined()
+		expect(document.body.querySelector('[data-testid="variants-summary"]')).toBeNull()
+		expect(document.body.querySelector('[data-testid="request-reference"]')).toBeNull()
+	})
+
+	it.each([
+		['thumb', '400', '300', '80'],
+		['hero', '1200', '630', '82'],
+	])('A template opens the form pre-filled: %s', async (name, width, height, quality) => {
+		await mountPage({ routes: emptyRoutes })
+
+		const template = Array.from(document.body.querySelectorAll('button')).find((button) =>
+			button.textContent?.startsWith(name),
+		)!
+		await click(template)
+
+		expect(document.body.querySelector('[role="dialog"]')?.textContent).toContain('Add variant')
+		const form = document.body.querySelector('[role="dialog"]')!
+		expect((form.querySelector('[data-field="name"] input') as HTMLInputElement).value).toBe(
+			name,
+		)
+		expect((form.querySelector('[data-field="width"] input') as HTMLInputElement).value).toBe(
+			width,
+		)
+		expect((form.querySelector('[data-field="height"] input') as HTMLInputElement).value).toBe(
+			height,
+		)
+		expect((form.querySelector('[data-field="quality"] input') as HTMLInputElement).value).toBe(
+			quality,
+		)
+		expect(buttonIn(form, 'Add variant')!.disabled).toBe(false)
+	})
+})
+
+describe('Rule: Error loading', () => {
+	it.each([
+		['status 500', () => Promise.reject(new ApiError(500, undefined, 'boom'))],
+		['a network failure', () => Promise.reject(new NetworkError())],
+	])('A failed list request: %s', async (_name, failure) => {
+		await mountPage({ routes: { [LIST]: failure } })
+
+		expect(pageTitle()?.textContent).toBe('Image variants')
+		expect(document.body.querySelector('[role="tablist"]')).not.toBeNull()
+		const alert = document.body.querySelector<HTMLElement>('[role="alert"]')!
+		expect(textOf(alert)).toContain("Couldn't load variants")
+		expect(textOf(alert)).toContain('Check your connection and try again.')
+		expect(textOf(alert)).not.toContain('boom')
+		const retry = buttonIn(alert, 'Try again')!
+		expect(iconOf(retry)).toBe('i-lucide-rotate-cw')
+		expect(alert.querySelector('[data-slot="close"]')).toBeNull()
+		expect(variantsTable()).toBeUndefined()
+		expect(document.body.querySelector('[data-testid="variant-card"]')).toBeNull()
+		expect(document.body.querySelector('[data-testid="variants-summary"]')).toBeNull()
+		expect(document.body.querySelector('[data-testid="request-reference"]')).toBeNull()
+	})
+
+	it('Try again reloads', async () => {
+		let attempt = 0
+		await mountPage({
+			routes: {
+				[LIST]: () =>
+					++attempt === 1
+						? Promise.reject(new ApiError(500))
+						: Promise.resolve({ items: defaultFixture() }),
+			},
+		})
+
+		await click(findButton('Try again'))
+
+		expect(calls(LIST)).toHaveLength(2)
+		expect(document.body.querySelector('[role="alert"]')).toBeNull()
+		expect(rows()).toHaveLength(6)
+	})
+})
+
+describe('Rule: Status switch', () => {
+	it('Each row has a labelled switch paired with an icon and a word', async () => {
+		await mountPage()
+
+		expect(document.body.querySelectorAll('button[role="switch"]')).toHaveLength(6)
+		expect(switchOf('hero').getAttribute('aria-checked')).toBe('true')
+		expect(switchOf('print').getAttribute('aria-checked')).toBe('false')
+		expect(iconNames(rowOf('hero'))).toContain('i-lucide-circle-check')
+		expect(iconNames(rowOf('print'))).toContain('i-lucide-circle-off')
+		expect(switchOf('hero').className).toContain('w-8')
+		expect(switchOf('hero').className).toContain('h-4.5')
+	})
+
+	it.each([
+		['hero', 'enabled', PATCH_HERO, false, 'Disabled'],
+		['print', 'disabled', PATCH_PRINT, true, 'Enabled'],
+	])(
+		'Toggling sends PATCH and updates the row: %s is %s',
+		async (name, _before, route, after, label) => {
+			const pending = deferred<unknown>()
+			const original = defaultFixture().find((item) => item.name === name)!
+			await mountPage({ routes: { [route]: () => pending.promise } })
+
+			await click(switchOf(name))
+
+			expect(JSON.parse(String((calls(route)[0]![1] as RequestInit).body))).toEqual({
+				enabled: after,
+			})
+			expect(switchOf(name).disabled).toBe(true)
+			pending.resolve({ ...original, enabled: after })
+			await flushPromises()
+			expect(statusOf(name)).toBe(label)
+			expect(switchOf(name).disabled).toBe(false)
+			expect(textOf(rowOf(name))).toContain(`${original.generated_files}`)
+			expect(calls(`POST /v1/image-variants/${name}/purge`)).toHaveLength(0)
+			expect(toasts.add).not.toHaveBeenCalled()
+		},
+	)
+
+	it('A toggle shows the response generated_files and cache_size', async () => {
+		await mountPage({
+			routes: {
+				[PATCH_HERO]: () =>
+					Promise.resolve(
+						variant({ enabled: false, generated_files: 5, cache_size: 2 * MB }),
+					),
+			},
+		})
+
+		await click(switchOf('hero'))
+
+		expect(textOf(rowOf('hero'))).toBe('hero 1200×630 cover WebP 82 5 2 MB Disabled')
+	})
+
+	it.each([
+		[403, "You don't have access", 'Only admins can manage image variants.'],
+		[404, 'Not found', NOT_FOUND_TEXT],
+		[500, 'Something went wrong', SERVER_TEXT],
+	])('A failed toggle reverts and reports: %s', async (status, title, text) => {
+		await mountPage({ routes: { [PATCH_HERO]: () => Promise.reject(new ApiError(status)) } })
+
+		await click(switchOf('hero'))
+
+		expect(statusOf('hero')).toBe('Enabled')
+		expect(switchOf('hero').getAttribute('aria-checked')).toBe('true')
+		expect(switchOf('hero').disabled).toBe(false)
+		expect(toastCalls(toasts)).toEqual([{ title, description: text, color: 'error' }])
+	})
+})
+
+describe('Rule: Row menu', () => {
+	it('The ellipsis opens a three-item menu', async () => {
+		await mountPage()
+
+		const button = buttonByLabel('Actions for hero')!
+		expect(button.getAttribute('aria-label')).toBe('Actions for hero')
+		await click(button)
+
+		const menu = document.body.querySelector<HTMLElement>('[role="menu"]')!
+		expect(menu.className).toContain('w-44')
+		const items = Array.from(menu.querySelectorAll<HTMLElement>('[role="menuitem"]'))
+		expect(items.map((item) => item.textContent?.trim())).toEqual([
+			'Edit',
+			'Purge cache',
+			'Delete',
+		])
+		expect(items.every((item) => item.className.includes('h-8'))).toBe(true)
+		expect(items.every((item) => item.className.includes('max-sm:h-11'))).toBe(true)
+		expect(items[2]!.className).toContain('text-error')
+		expect(button.className).toContain('data-[state=open]:outline-primary')
+		expect(button.getAttribute('data-state')).toBe('open')
+	})
+
+	it('Menu keyboard behaviour: Escape closes the menu with focus back on the ellipsis button', async () => {
+		await mountPage()
+		const button = buttonByLabel('Actions for hero')!
+		button.focus()
+		await click(button)
+
+		await pressEscape()
+
+		await vi.waitFor(() => expect(document.body.querySelector('[role="menu"]')).toBeNull())
+		await vi.waitFor(() => expect(document.activeElement).toBe(button))
+	})
+
+	it('Menu items: Edit opens the slide-over in edit mode', async () => {
+		await mountPage()
+		await openMenu('hero')
+
+		await click(menuItem('Edit'))
+
+		expect(document.body.querySelector('[role="dialog"]')?.textContent).toContain(
+			'Edit variant: hero',
+		)
+	})
+
+	it('Menu items: Purge cache opens the purge dialog', async () => {
+		await mountPage()
+		await openMenu('hero')
+
+		await click(menuItem('Purge cache'))
+
+		expect(alertDialog()?.textContent).toContain('Purge cache for “hero”?')
+	})
+
+	it('Menu items: Delete opens the delete dialog', async () => {
+		await mountPage()
+		await openMenu('hero')
+
+		await click(menuItem('Delete'))
+
+		expect(alertDialog()?.textContent).toContain('Delete variant “hero”?')
+	})
+})
+
+describe('Rule: Purge cache', () => {
+	async function openPurge() {
+		await openMenu('hero')
+		await click(menuItem('Purge cache'))
+	}
+
+	it('The purge dialog', async () => {
+		await mountPage()
+
+		await openPurge()
+
+		const dialog = alertDialog()!
+		expect(textOf(dialog)).toContain('Purge cache for “hero”?')
+		expect(textOf(dialog)).toContain(
+			'This removes 244 generated files (84 MB). Files are generated again on the next request.',
+		)
+		const buttons = Array.from(dialog.querySelectorAll('button')).map((button) =>
+			button.textContent?.trim(),
+		)
+		expect(buttons).toEqual(['Cancel', 'Purge 244 files'])
+		expect(dialog.contains(document.activeElement)).toBe(true)
+	})
+
+	it('Cancel closes without a request', async () => {
+		await mountPage()
+		await openPurge()
+
+		await click(buttonIn(alertDialog()!, 'Cancel'))
+
+		expect(alertDialog()).toBeNull()
+		expect(calls(PURGE_HERO)).toHaveLength(0)
+		expect(textOf(rowOf('hero'))).toContain('244 84 MB')
+		expect(document.activeElement).toBe(buttonByLabel('Actions for hero'))
+	})
+
+	it('Escape closes the dialog without a request', async () => {
+		await mountPage()
+		await openPurge()
+
+		await pressEscape()
+
+		expect(alertDialog()).toBeNull()
+		expect(calls(PURGE_HERO)).toHaveLength(0)
+	})
+
+	it('Confirming purges while the row is dimmed', async () => {
+		const pending = deferred<unknown>()
+		await mountPage({ routes: { [PURGE_HERO]: () => pending.promise } })
+		await openPurge()
+
+		await click(buttonIn(alertDialog()!, 'Purge 244 files'))
+
+		expect(calls(PURGE_HERO)).toHaveLength(1)
+		expect(alertDialog()).toBeNull()
+		expect(rowOf('hero').className).toContain('bg-elevated')
+		expect(switchOf('hero').disabled).toBe(true)
+		expect(buttonByLabel('Actions for hero')!.disabled).toBe(true)
+		expect(statusOf('hero')).toBe('Purging…')
+		expect(iconNames(rowOf('hero'))).toContain('i-lucide-loader-circle')
+		expect(rowOf('hero').querySelector('.text-info')).not.toBeNull()
+		expect(switchOf('card').disabled).toBe(false)
+		expect(buttonByLabel('Actions for card')!.disabled).toBe(false)
+		pending.resolve({ purged_files: 244, purged_bytes: 88080384 })
+		await flushPromises()
+	})
+
+	it('Purge succeeds', async () => {
+		await mountPage({
+			routes: {
+				[PURGE_HERO]: () => Promise.resolve({ purged_files: 244, purged_bytes: 88080384 }),
+			},
+		})
+		await openPurge()
+
+		await click(buttonIn(alertDialog()!, 'Purge 244 files'))
+
+		expect(textOf(rowOf('hero'))).toBe('hero 1200×630 cover WebP 82 0 0 KB Enabled')
+		expect(switchOf('hero').disabled).toBe(false)
+		expect(buttonByLabel('Actions for hero')!.disabled).toBe(false)
+		expect(summary()).toBe('6 variants · 1,040 generated files · 128 MB')
+		expect(calls(LIST)).toHaveLength(1)
+		expect(toastCalls(toasts)).toEqual([
+			{ title: 'Purged 244 files from “hero”', description: undefined, color: 'success' },
+		])
+	})
+
+	it.each([
+		[404, 'Not found', NOT_FOUND_TEXT],
+		[500, 'Something went wrong', SERVER_TEXT],
+	])('Purge fails: %s', async (status, title, text) => {
+		await mountPage({ routes: { [PURGE_HERO]: () => Promise.reject(new ApiError(status)) } })
+		await openPurge()
+
+		await click(buttonIn(alertDialog()!, 'Purge 244 files'))
+
+		expect(textOf(rowOf('hero'))).toBe('hero 1200×630 cover WebP 82 244 84 MB Enabled')
+		expect(switchOf('hero').disabled).toBe(false)
+		expect(buttonByLabel('Actions for hero')!.disabled).toBe(false)
+		expect(toastCalls(toasts)).toEqual([{ title, description: text, color: 'error' }])
+	})
+})
+
+describe('Rule: Delete variant', () => {
+	async function openDelete(name = 'hero') {
+		await openMenu(name)
+		await click(menuItem('Delete'))
+	}
+
+	it('The delete dialog', async () => {
+		await mountPage()
+
+		await openDelete()
+
+		const dialog = alertDialog()!
+		expect(textOf(dialog)).toContain('Delete variant “hero”?')
+		expect(textOf(dialog)).toContain(
+			"This removes the variant and its 244 generated files (84 MB). Articles that use ?v=hero will start returning 400. This can't be undone.",
+		)
+		const buttons = Array.from(dialog.querySelectorAll('button'))
+		expect(buttons.map((button) => button.textContent?.trim())).toEqual([
+			'Cancel',
+			'Delete variant',
+		])
+		expect(buttons[1]!.className).toContain('bg-error')
+	})
+
+	it('Confirming shows a spinner and blocks dismissal', async () => {
+		const pending = deferred<unknown>()
+		await mountPage({ routes: { [DELETE_HERO]: () => pending.promise } })
+		await openDelete()
+
+		await click(buttonIn(alertDialog()!, 'Delete variant'))
+
+		expect(calls(DELETE_HERO)).toHaveLength(1)
+		const dialog = alertDialog()!
+		expect(buttonIn(dialog, 'Cancel')!.disabled).toBe(true)
+		const confirm = buttonIn(dialog, 'Delete variant')!
+		expect(iconNames(confirm)).toContain('i-lucide-loader-circle')
+		await pressEscape()
+		expect(alertDialog()).not.toBeNull()
+		pending.resolve(undefined)
+		await flushPromises()
+	})
+
+	it('Delete succeeds', async () => {
+		await mountPage({ routes: { [DELETE_HERO]: () => Promise.resolve(undefined) } })
+		await openDelete()
+
+		await click(buttonIn(alertDialog()!, 'Delete variant'))
+
+		expect(alertDialog()).toBeNull()
+		expect(rows().map((row) => textOf(row).split(' ')[0])).toEqual([
+			'card',
+			'og',
+			'print',
+			'square',
+			'thumb',
+		])
+		expect(summary()).toBe('5 variants · 1,040 generated files · 128 MB')
+		expect(toastCalls(toasts)).toEqual([
+			{ title: 'Variant “hero” deleted', description: undefined, color: 'success' },
+		])
+	})
+
+	it('Deleting the last variant shows the empty state', async () => {
+		await mountPage({
+			routes: {
+				[LIST]: () => Promise.resolve({ items: [variant({ name: 'thumb' })] }),
+				'DELETE /v1/image-variants/thumb': () => Promise.resolve(undefined),
+			},
+		})
+		await openDelete('thumb')
+
+		await click(buttonIn(alertDialog()!, 'Delete variant'))
+
+		expect(document.body.textContent).toContain('No variants yet')
+		expect(variantsTable()).toBeUndefined()
+	})
+
+	it('Delete fails: 404 reloads the list and reports', async () => {
+		let listCalls = 0
+		await mountPage({
+			routes: {
+				[LIST]: () => {
+					listCalls++
+					return Promise.resolve({
+						items:
+							listCalls === 1
+								? defaultFixture()
+								: defaultFixture().filter((v) => v.name !== 'hero'),
+					})
+				},
+				[DELETE_HERO]: () => Promise.reject(new ApiError(404)),
+			},
+		})
+		await openDelete()
+
+		await click(buttonIn(alertDialog()!, 'Delete variant'))
+
+		expect(alertDialog()).toBeNull()
+		expect(calls(LIST)).toHaveLength(2)
+		expect(toastCalls(toasts)).toEqual([
+			{ title: 'Not found', description: NOT_FOUND_TEXT, color: 'error' },
+		])
+	})
+
+	it('Delete fails: 500 keeps the row and reports', async () => {
+		await mountPage({ routes: { [DELETE_HERO]: () => Promise.reject(new ApiError(500)) } })
+		await openDelete()
+
+		await click(buttonIn(alertDialog()!, 'Delete variant'))
+
+		expect(alertDialog()).toBeNull()
+		expect(rows()).toHaveLength(6)
+		expect(calls(LIST)).toHaveLength(1)
+		expect(toastCalls(toasts)).toEqual([
+			{ title: 'Something went wrong', description: SERVER_TEXT, color: 'error' },
+		])
+	})
+})
+
+describe('Rule: Request reference card', () => {
+	it('The card under the table', async () => {
+		await mountPage()
+
+		const card = document.body.querySelector<HTMLElement>('[data-testid="request-reference"]')!
+		expect(card.querySelector('h2')?.textContent).toBe('How requests are handled')
+		const cardRows = Array.from(card.querySelectorAll('tbody tr')).map(textOf)
+		expect(cardRows).toEqual([
+			'/static/uploadedImages/photo.png?v=thumb 200 Image',
+			'Unknown or disabled variant 400 Unknown variant',
+			'width, height, format or quality 400 Unsupported parameter',
+			'Missing source image 404 Not found',
+		])
+		expect(card.querySelector('tbody tr td span')!.className).toContain('font-mono')
+		const badges = Array.from(card.querySelectorAll('tbody tr td:nth-child(2) > *'))
+		expect(badges.map((badge) => badge.className.includes('bg-(--rc-success-soft)'))).toEqual([
+			true,
+			false,
+			false,
+			false,
+		])
+		expect(
+			badges.slice(1).every((badge) => badge.className.includes('bg-(--rc-error-soft)')),
+		).toBe(true)
+		expect(iconNames(card)).toEqual(
+			expect.arrayContaining(['i-lucide-circle-check', 'i-lucide-circle-x']),
+		)
+		expect(textOf(card.querySelector('div.flex.flex-col.gap-1\\.5')!)).toContain(
+			'Body of a 400 response',
+		)
+		expect(card.querySelector('pre')!.textContent).toBe(
+			'{\n  "status": 400,\n  "error": "unknown_variant",\n  "message": "Unknown variant",\n  "detail": "banner"\n}',
+		)
+		expect(card.querySelector('p')!.textContent).toBe(
+			'unsupported_parameter replaces unknown_variant when a raw parameter is sent. There is no arbitrary-size mode.',
+		)
+	})
+
+	it('The card has one column on mobile', async () => {
+		await mountPage({ desktop: false })
+
+		const grid = document.body.querySelector<HTMLElement>(
+			'[data-testid="request-reference"] .grid',
+		)!
+		expect(grid.className).toContain('grid-cols-1')
+		expect(grid.className).toContain('sm:grid-cols-')
+	})
+
+	it.each([
+		['Loading', { [LIST]: () => new Promise(() => undefined) }],
+		['Empty', { [LIST]: () => Promise.resolve({ items: [] }) }],
+		['Error', { [LIST]: () => Promise.reject(new ApiError(500)) }],
+	])('The card is not drawn when the state is %s', async (_state, routes) => {
+		vi.useFakeTimers({ toFake: ['setTimeout', 'clearTimeout'] })
+		await mountPage({ routes })
+		vi.advanceTimersByTime(200)
+		await flushPromises()
+
+		expect(document.body.querySelector('[data-testid="request-reference"]')).toBeNull()
+	})
+})
+
+describe('Rule: Accessibility and hygiene', () => {
+	it('Status is never colour alone', async () => {
+		await mountPage()
+
+		for (const item of defaultFixture()) {
+			const row = rowOf(item.name)
+			expect(statusOf(item.name)).toMatch(/^(Enabled|Disabled|Purging…)$/)
+			expect(iconNames(row).some((name) => /circle-(check|off)/.test(name))).toBe(true)
+		}
+	})
+
+	it('Touch targets on mobile', async () => {
+		await mountPage({ desktop: false })
+
+		expect(buttonByLabel('Actions for hero')!.className).toContain('max-sm:size-11')
+		expect(findButton('Add variant')!.className).toContain('h-11')
+		expect(switchOf('hero').className).toContain('before:-inset-3.5')
+		expect(document.body.querySelectorAll('[role="tab"]')[0]!.className).toContain(
+			'max-sm:h-11',
+		)
+	})
+
+	it('Vocabulary', async () => {
+		await mountPage()
+		await openMenu('hero')
+
+		const text = document.body.textContent!.toLowerCase()
+		expect(text).not.toContain('thumbnail preset')
+		expect(text).not.toContain('rendition')
+		expect(text).not.toMatch(/\bversion\b/)
+	})
+})
+
+describe('Rule: French strings', () => {
+	it('renders the list in French with no English left over', async () => {
+		const { setLocale } = await import('@/i18n')
+		setLocale('fr')
+
+		await mountPage()
+
+		expect(pageTitle()?.textContent).toBe('Variantes d’image')
+		expect(rows().map((row) => textOf(row).split(' ')[0])).toEqual([
+			'card',
+			'hero',
+			'og',
+			'print',
+			'square',
+			'thumb',
+		])
+		expect(summary()).toBe('6 variantes · 1 284 fichiers générés · 212 Mo')
+		expect(textOf(rowOf('print'))).toContain('Désactivée')
+		expect(document.body.textContent).toContain('Traitement des requêtes')
+		const text = document.body.textContent!
+		for (const english of [
+			'Image variants',
+			'generated files',
+			'How requests',
+			'Enabled',
+			'Disabled',
+			'Add variant',
+			'Cache size',
+		]) {
+			expect(text).not.toContain(english)
+		}
+	})
+})
diff --git a/web/src/views/__tests__/variantsTestKit.ts b/web/src/views/__tests__/variantsTestKit.ts
new file mode 100644
index 0000000..4b11d0c
--- /dev/null
+++ b/web/src/views/__tests__/variantsTestKit.ts
@@ -0,0 +1,350 @@
+import { vi } from 'vitest'
+import { flushPromises, mount, type VueWrapper } from '@vue/test-utils'
+import { createPinia, setActivePinia } from 'pinia'
+import { defineComponent, h } from 'vue'
+import uiPlugin from '@nuxt/ui/vue-plugin'
+import UApp from '@nuxt/ui/components/App.vue'
+import router from '@/router'
+import { useApi } from '@/composables/useApi'
+import type { ImageVariant } from '@/composables/useImageVariants'
+import { useSessionStore } from '@/stores/session'
+import VariantsPage from '../VariantsPage.vue'
+
+export const MB = 1048576
+export const LIST = 'GET /v1/image-variants'
+export const CREATE = 'POST /v1/image-variants'
+
+export type Handler = (body?: Record<string, unknown>) => Promise<unknown>
+
+export interface MountOptions {
+	desktop?: boolean
+	role?: string | null
+	routes?: Record<string, Handler>
+}
+
+export function variant(overrides: Partial<ImageVariant>): ImageVariant {
+	return {
+		name: 'hero',
+		width: 1200,
+		height: 630,
+		fit: 'cover',
+		format: 'webp',
+		quality: 82,
+		generate_on_upload: false,
+		enabled: true,
+		generated_files: 244,
+		cache_size: 84 * MB,
+		created_at: '2026-03-12T09:00:00Z',
+		updated_at: '2026-03-12T09:00:00Z',
+		...overrides,
+	}
+}
+
+export function defaultFixture(): ImageVariant[] {
+	return [
+		variant({
+			name: 'card',
+			width: 800,
+			height: null,
+			fit: 'inside',
+			quality: 80,
+			generated_files: 318,
+			cache_size: 58 * MB,
+		}),
+		variant({}),
+		variant({
+			name: 'og',
+			format: 'jpeg',
+			quality: 80,
+			generated_files: 96,
+			cache_size: 9 * MB,
+		}),
+		variant({
+			name: 'print',
+			width: null,
+			height: 2400,
+			fit: 'inside',
+			format: 'png',
+			quality: null,
+			enabled: false,
+			generated_files: 74,
+			cache_size: 21 * MB,
+		}),
+		variant({
+			name: 'square',
+			width: 600,
+			height: 600,
+			format: 'jpeg',
+			quality: 85,
+			generated_files: 140,
+			cache_size: 19 * MB,
+		}),
+		variant({
+			name: 'thumb',
+			width: 400,
+			height: 300,
+			quality: 80,
+			generated_files: 412,
+			cache_size: 21 * MB,
+		}),
+	]
+}
+
+export function deferred<T>() {
+	let resolve!: (value: T) => void
+	let reject!: (reason: unknown) => void
+	const promise = new Promise<T>((res, rej) => {
+		resolve = res
+		reject = rej
+	})
+	return { promise, resolve, reject }
+}
+
+export function setViewport(desktop: boolean) {
+	window.matchMedia = ((query: string) => ({
+		matches: desktop,
+		media: query,
+		onchange: null,
+		addEventListener: () => undefined,
+		removeEventListener: () => undefined,
+		addListener: () => undefined,
+		removeListener: () => undefined,
+		dispatchEvent: () => false,
+	})) as unknown as typeof window.matchMedia
+}
+
+export let requestMock: ReturnType<typeof vi.fn>
+export let wrapper: VueWrapper | null = null
+
+export async function mountPage(options: MountOptions = {}) {
+	const { desktop = true, role = 'owner', routes = {} } = options
+	setViewport(desktop)
+	setActivePinia(createPinia())
+	const session = useSessionStore()
+	const sessionRole = role ?? undefined
+	session.session = {
+		verified: true,
+		username: 'marta',
+		id: 1,
+		displayName: 'Marta Alves',
+		role: sessionRole as 'owner' | 'admin' | undefined,
+	}
+	session.status = 'ready'
+	requestMock = vi.fn((path: string, init?: RequestInit) => {
+		const key = `${init?.method ?? 'GET'} ${path}`
+		const handler =
+			routes[key] ??
+			(key === LIST ? () => Promise.resolve({ items: defaultFixture() }) : null)
+		if (!handler) {
+			throw new Error(`Unexpected request: ${key}`)
+		}
+		return handler(
+			init?.body ? (JSON.parse(String(init.body)) as Record<string, unknown>) : undefined,
+		)
+	})
+	vi.mocked(useApi).mockReturnValue({
+		getMe: vi
+			.fn()
+			.mockResolvedValue({ verified: true, username: 'marta', id: 1, role: sessionRole }),
+		request: requestMock,
+	})
+	await router.push('/settings/media/variants')
+	const Host = defineComponent({ render: () => h(UApp, null, () => h(VariantsPage)) })
+	wrapper = mount(Host, {
+		attachTo: document.body,
+		global: { plugins: [router, uiPlugin] },
+	})
+	await flushPromises()
+	return wrapper
+}
+
+export async function unmountPage() {
+	wrapper?.unmount()
+	wrapper = null
+	vi.useRealTimers()
+	document.body.innerHTML = ''
+	await router.push('/login')
+}
+
+export function textOf(element: Element) {
+	const walker = document.createTreeWalker(element, NodeFilter.SHOW_TEXT)
+	const parts: string[] = []
+	while (walker.nextNode()) {
+		const text = walker.currentNode.textContent?.trim()
+		if (text) {
+			parts.push(text)
+		}
+	}
+	return parts.join(' ')
+}
+
+export function rows() {
+	return Array.from(
+		document.body.querySelectorAll<HTMLElement>('tbody tr, [data-testid="variant-card"]'),
+	).filter((row) => !row.closest('[data-testid="request-reference"]'))
+}
+
+export function pageTitle() {
+	return document.body.querySelector('h1:not([data-slot="title"])')
+}
+
+export function variantsTable() {
+	return Array.from(document.body.querySelectorAll('table')).find(
+		(table) => !table.closest('[data-testid="request-reference"]'),
+	)
+}
+
+export function rowOf(name: string) {
+	return rows().find((row) => row.textContent?.includes(name))!
+}
+
+export function buttonIn(root: ParentNode, text: string) {
+	return Array.from(root.querySelectorAll('button')).find(
+		(button) => button.textContent?.trim() === text,
+	)
+}
+
+export function findButton(text: string) {
+	return buttonIn(document.body, text)
+}
+
+export function buttonByLabel(label: string) {
+	return document.body.querySelector<HTMLButtonElement>(`button[aria-label="${label}"]`)
+}
+
+export async function click(element: HTMLElement | null | undefined) {
+	element?.click()
+	await flushPromises()
+}
+
+export function calls(key: string) {
+	return requestMock.mock.calls.filter(
+		([path, init]) => `${(init as RequestInit | undefined)?.method ?? 'GET'} ${path}` === key,
+	)
+}
+
+export function bodyOf(key: string, index = 0) {
+	return JSON.parse(String((calls(key)[index]![1] as RequestInit).body)) as Record<
+		string,
+		unknown
+	>
+}
+
+export function toastCalls(toasts: { add: ReturnType<typeof vi.fn> }) {
+	return toasts.add.mock.calls.map(([source]) => ({
+		title: (source as { title?: string }).title,
+		description: (source as { description?: string }).description,
+		color: (source as { color?: string }).color,
+	}))
+}
+
+export function dispatch(element: Element, type: string) {
+	element.dispatchEvent(new Event(type, { bubbles: true }))
+}
+
+export async function typeInto(input: HTMLInputElement | null | undefined, value: string) {
+	input!.value = value
+	dispatch(input!, 'input')
+	await flushPromises()
+}
+
+export async function blur(input: HTMLInputElement | null | undefined) {
+	dispatch(input!, 'blur')
+	await flushPromises()
+}
+
+export async function pressKey(element: Element, key: string, init: KeyboardEventInit = {}) {
+	element.dispatchEvent(
+		new KeyboardEvent('keydown', { key, bubbles: true, cancelable: true, ...init }),
+	)
+	await flushPromises()
+}
+
+export async function pressEscape() {
+	const target = document.activeElement ?? document.body
+	target.dispatchEvent(
+		new KeyboardEvent('keydown', { key: 'Escape', bubbles: true, cancelable: true }),
+	)
+	await flushPromises()
+}
+
+export function dialogs() {
+	return Array.from(
+		document.body.querySelectorAll<HTMLElement>('[role="dialog"], [role="alertdialog"]'),
+	)
+}
+
+export function alertDialog() {
+	return document.body.querySelector<HTMLElement>('[role="alertdialog"]')
+}
+
+export function slideover() {
+	return document.body.querySelector<HTMLElement>('[role="dialog"]')
+}
+
+export function field(name: string) {
+	return document.body.querySelector<HTMLInputElement>(
+		`[data-field="${name}"] input:not([aria-hidden="true"])`,
+	)
+}
+
+export function fieldMessage(name: string) {
+	return document.body
+		.querySelector(`[data-field="${name}"] [data-slot="error"]`)
+		?.textContent?.trim()
+}
+
+export function fieldHelp(name: string) {
+	return document.body
+		.querySelector(`[data-field="${name}"] [data-slot="help"]`)
+		?.textContent?.trim()
+}
+
+export async function openMenu(name: string) {
+	await click(buttonByLabel(`Actions for ${name}`))
+}
+
+export function menuItem(label: string) {
+	return Array.from(document.body.querySelectorAll<HTMLElement>('[role="menuitem"]')).find(
+		(item) => item.textContent?.trim() === label,
+	)
+}
+
+export async function openAddForm() {
+	const opener = document.body.querySelector<HTMLElement>('[data-testid="add-variant"]')!
+	opener.focus()
+	opener.click()
+	await flushPromises()
+}
+
+export async function openEditForm(name: string) {
+	await openMenu(name)
+	await click(menuItem('Edit'))
+}
+
+export function stubBrowser() {
+	vi.stubGlobal(
+		'ResizeObserver',
+		class {
+			observe() {}
+			unobserve() {}
+			disconnect() {}
+		},
+	)
+}
+
+export async function clickBackdrop() {
+	const overlay = document.body.querySelector<HTMLElement>('[data-slot="overlay"]')!
+	await new Promise((resolve) => setTimeout(resolve, 20))
+	const down = new MouseEvent('pointerdown', { bubbles: true, button: 0 })
+	Object.defineProperty(down, 'pointerType', { value: 'mouse' })
+	overlay.dispatchEvent(down)
+	overlay.dispatchEvent(new MouseEvent('click', { bubbles: true }))
+	await flushPromises()
+}
+
+export function stubClipboard() {
+	const writeText = vi.fn().mockResolvedValue(undefined)
+	Object.defineProperty(navigator, 'clipboard', { configurable: true, value: { writeText } })
+	return writeText
+}
diff --git a/web/visual/check.ts b/web/visual/check.ts
index 552b747..2f376d0 100644
--- a/web/visual/check.ts
+++ b/web/visual/check.ts
@@ -186,7 +186,72 @@ function tableStates(markdown: string) {
 		.filter((cell) => cell !== 'State' && !/^-+$/.test(cell))
 }
 
+const variantsBoard = 'RenewCMS Screens Image variants.dc.html'
+
+function numberedStates(prefix: string, names: string[]) {
+	return Object.fromEntries(
+		names.map((state, index) => [
+			state,
+			`${prefix}${String.fromCharCode(97 + index)} · ${state}`,
+		]),
+	)
+}
+
+function variantsScreen(): Screen {
+	const listNames = [
+		'Loaded',
+		'Loading',
+		'Empty',
+		'Error loading',
+		'Forbidden',
+		'Row menu',
+		'Row action in progress',
+		'Purge confirm',
+		'Delete confirm',
+		'Delete in progress',
+		'Request reference',
+		'Entry: sidebar',
+	]
+	const formNames = [
+		'Create: pristine',
+		'Create: dirty',
+		'Field errors',
+		'No dimension',
+		'Name already taken',
+		'Saving',
+		'Save error',
+		'Edit: pristine',
+		'Edit: dirty',
+		'Unsaved changes',
+		'PNG: no quality',
+	]
+	const sources: Source[] = [
+		{
+			board: variantsBoard,
+			group: 'Variants list',
+			states: listNames,
+			alias: numberedStates('1', listNames),
+		},
+		{
+			board: variantsBoard,
+			group: 'Add edit variant',
+			states: formNames,
+			alias: numberedStates('2', formNames),
+		},
+	]
+	return {
+		name: 'image-variants',
+		board: variantsBoard,
+		group: 'Variants list',
+		states: [...listNames, ...formNames],
+		sources,
+	}
+}
+
 async function readScreen(name: string): Promise<Screen> {
+	if (name === 'image-variants') {
+		return variantsScreen()
+	}
 	const markdown = await readFile(join(designRoot, 'screens', `${name}.md`), 'utf8')
 	const reference = /\*\*Visual reference:\*\* `source\/([^`]+)`, group "([^"]+)"/.exec(markdown)
 	if (!reference) {
diff --git a/web/visual/states.ts b/web/visual/states.ts
index 862deb9..13f85d4 100644
--- a/web/visual/states.ts
+++ b/web/visual/states.ts
@@ -3095,6 +3095,339 @@ const activityStates: Record<string, VisualState> = {
 	Details: activityClockSensitive,
 }
 
+const variantsPath = '/settings/media/variants'
+const variantsMegabyte = 1048576
+
+const variantsSession: ApiMock = {
+	status: 200,
+	body: {
+		id: 1,
+		is_verified: true,
+		username: 'marta',
+		email: 'marta@renew.example',
+		display_name: 'Marta Alves',
+		role: 'owner',
+	},
+}
+
+function boardVariant(
+	name: string,
+	width: number | null,
+	height: number | null,
+	fit: string,
+	format: string,
+	quality: number | null,
+	files: number,
+	megabytes: number,
+	enabled = true,
+) {
+	return {
+		name,
+		width,
+		height,
+		fit,
+		format,
+		quality,
+		generate_on_upload: false,
+		enabled,
+		generated_files: files,
+		cache_size: megabytes * variantsMegabyte,
+		created_at: '2026-03-12T09:00:00Z',
+		updated_at: '2026-03-12T09:00:00Z',
+	}
+}
+
+const variantsBoardList = [
+	boardVariant('thumb', 400, 300, 'cover', 'webp', 80, 412, 21),
+	boardVariant('card', 800, null, 'inside', 'webp', 80, 318, 58),
+	boardVariant('hero', 1200, 630, 'cover', 'webp', 82, 244, 84),
+	boardVariant('square', 600, 600, 'cover', 'jpeg', 85, 140, 19),
+	boardVariant('og', 1200, 630, 'cover', 'jpeg', 80, 96, 9),
+	boardVariant('print', null, 2400, 'inside', 'png', null, 74, 21, false),
+]
+
+function variantsApi(
+	items: unknown[] = variantsBoardList,
+	overrides: Record<string, ApiMock> = {},
+): Record<string, ApiMock> {
+	return {
+		'GET /v1/auth/me': variantsSession,
+		'GET /v1/image-variants': { status: 200, body: { items } },
+		...overrides,
+	}
+}
+
+function variantsListState(
+	overrides: Record<string, ApiMock> = {},
+	steps?: VisualState['steps'],
+	items: unknown[] = variantsBoardList,
+): VisualState {
+	return { path: variantsPath, api: variantsApi(items, overrides), steps }
+}
+
+async function openVariantMenu(page: Page, name: string) {
+	await page.getByRole('button', { name: `Actions for ${name}`, exact: true }).click()
+	await page.getByRole('menu').waitFor()
+}
+
+async function chooseVariantMenuItem(page: Page, name: string, item: string) {
+	await openVariantMenu(page, name)
+	await page.getByRole('menuitem', { name: item, exact: true }).click()
+}
+
+async function scrollVariantsPage(page: Page, offset: number) {
+	await page.evaluate((value) => {
+		const body = document
+			.querySelector<HTMLElement>('#dashboard-content')
+			?.closest<HTMLElement>('[data-slot="body"]')
+		if (body) body.scrollTop = value
+	}, offset)
+	await page.waitForTimeout(150)
+}
+
+async function scrollVariantsForm(page: Page, offset: number) {
+	await page.evaluate((value) => {
+		const body = document.querySelector<HTMLElement>('[role="dialog"] [data-slot="body"]')
+		if (body) body.scrollTop = value
+	}, offset)
+	await page.waitForTimeout(150)
+}
+
+function isMobileViewport(page: Page) {
+	return (page.viewportSize()?.width ?? 0) < 640
+}
+
+async function openVariantForm(page: Page) {
+	await page.getByRole('button', { name: 'Add variant', exact: true }).first().click()
+	await page.getByRole('dialog').waitFor()
+}
+
+function variantField(page: Page, name: string) {
+	return page.locator(`[data-field="${name}"] input:not([aria-hidden="true"])`)
+}
+
+async function pickVariantFormat(page: Page, label: string) {
+	await page.getByRole('dialog').getByRole('combobox').click()
+	await page.getByRole('option', { name: label, exact: true }).click()
+}
+
+interface VariantFormFill {
+	name: string
+	width: string
+	height: string
+	format: string
+	quality?: string
+	generate?: boolean
+}
+
+async function fillVariantForm(page: Page, values: VariantFormFill) {
+	await variantField(page, 'name').fill(values.name)
+	await variantField(page, 'width').fill(values.width)
+	await variantField(page, 'height').fill(values.height)
+	await pickVariantFormat(page, values.format)
+	if (values.quality !== undefined) {
+		await variantField(page, 'quality').fill(values.quality)
+	}
+	if (values.generate) {
+		await page.getByRole('switch', { name: 'Generate on upload', exact: true }).click()
+	}
+}
+
+const heroForm: VariantFormFill = {
+	name: 'hero',
+	width: '1200',
+	height: '630',
+	format: 'WebP',
+	quality: '82',
+	generate: true,
+}
+
+async function blurFocus(page: Page) {
+	await page.evaluate(() => (document.activeElement as HTMLElement | null)?.blur())
+	await page.waitForTimeout(100)
+}
+
+async function pressVariantFormButton(page: Page, label: string) {
+	await page.getByRole('dialog').getByRole('button', { name: label, exact: true }).click()
+}
+
+async function openEditHero(page: Page) {
+	await chooseVariantMenuItem(page, 'hero', 'Edit')
+	await page.getByRole('dialog').waitFor()
+}
+
+const variantsStates: Record<string, VisualState> = {
+	Loaded: variantsListState(),
+	Loading: {
+		path: variantsPath,
+		api: variantsApi(variantsBoardList, {
+			'GET /v1/image-variants': { status: 200, hang: true },
+		}),
+	},
+	Empty: variantsListState({}, undefined, []),
+	'Error loading': variantsListState({ 'GET /v1/image-variants': { status: 500 } }),
+	Forbidden: {
+		path: variantsPath,
+		api: {
+			'GET /v1/auth/me': {
+				status: 200,
+				body: { ...(variantsSession.body as object), role: 'user' },
+			},
+		},
+	},
+	'Row menu': variantsListState({}, (page) => openVariantMenu(page, 'hero')),
+	'Row action in progress': variantsListState(
+		{ 'POST /v1/image-variants/hero/purge': { status: 200, hang: true } },
+		async (page) => {
+			await chooseVariantMenuItem(page, 'hero', 'Purge cache')
+			await page
+				.getByRole('alertdialog')
+				.getByRole('button', { name: 'Purge 244 files' })
+				.click()
+			await page.mouse.move(0, 0)
+		},
+	),
+	'Purge confirm': variantsListState({}, async (page) => {
+		await chooseVariantMenuItem(page, 'hero', 'Purge cache')
+		await page.getByRole('alertdialog').waitFor()
+		await page.mouse.move(0, 0)
+	}),
+	'Delete confirm': variantsListState({}, async (page) => {
+		await chooseVariantMenuItem(page, 'hero', 'Delete')
+		await page.getByRole('alertdialog').waitFor()
+		await page.mouse.move(0, 0)
+	}),
+	'Delete in progress': variantsListState(
+		{ 'DELETE /v1/image-variants/hero': { status: 204, hang: true } },
+		async (page) => {
+			await chooseVariantMenuItem(page, 'hero', 'Delete')
+			await page
+				.getByRole('alertdialog')
+				.getByRole('button', { name: 'Delete variant' })
+				.click()
+			await page.mouse.move(0, 0)
+		},
+	),
+	'Entry: sidebar': {
+		path: '/media',
+		origin: mediaOrigin,
+		api: mediaApi({ 'GET /v1/auth/me': variantsSession }),
+		steps: async (page) => {
+			if (isMobileViewport(page)) {
+				await page.locator('[data-slot="toggle"]').first().click()
+			}
+			await page
+				.locator(
+					'nav[aria-label="Main"]:visible a[href="/settings"] [data-slot="linkTrailing"]',
+				)
+				.click()
+			await page.mouse.move(0, 0)
+			await page.waitForTimeout(250)
+		},
+	},
+	'Request reference': {
+		...variantsListState({}, async (page) => {
+			if (isMobileViewport(page)) {
+				await scrollVariantsPage(page, 900)
+			}
+		}),
+		exception: {
+			maxPercent: 21,
+			reason: 'board draws /media/photo.png?v=thumb (2 lines) and the mandated /static/uploadedImages/photo.png?v=thumb wraps to 3; board scroll 900 is unreachable (page max ~861)',
+			approvedBy: 'user',
+		},
+	},
+	'Create: pristine': variantsListState({}, openVariantForm),
+	'Create: dirty': variantsListState({}, async (page) => {
+		await openVariantForm(page)
+		await fillVariantForm(page, heroForm)
+		await page.locator('input[type="range"]').focus()
+		if (isMobileViewport(page)) {
+			await scrollVariantsForm(page, 560)
+		}
+	}),
+	'Field errors': variantsListState({}, async (page) => {
+		await openVariantForm(page)
+		await fillVariantForm(page, {
+			name: 'Hero banner',
+			width: '9000',
+			height: '630',
+			format: 'WebP',
+			quality: '140',
+		})
+		await variantField(page, 'name').blur()
+		await variantField(page, 'width').blur()
+		await variantField(page, 'quality').blur()
+		await blurFocus(page)
+	}),
+	'No dimension': variantsListState({}, async (page) => {
+		await openVariantForm(page)
+		await variantField(page, 'name').fill('banner')
+		await pickVariantFormat(page, 'WebP')
+		await pressVariantFormButton(page, 'Add variant')
+		await blurFocus(page)
+	}),
+	'Name already taken': variantsListState(
+		{
+			'POST /v1/image-variants': {
+				status: 409,
+				body: 'A variant named “thumb” already exists. Choose another name.',
+			},
+		},
+		async (page) => {
+			await openVariantForm(page)
+			await fillVariantForm(page, {
+				name: 'thumb',
+				width: '400',
+				height: '300',
+				format: 'WebP',
+				quality: '80',
+				generate: true,
+			})
+			await pressVariantFormButton(page, 'Add variant')
+			await page.getByText('already exists').waitFor()
+			await blurFocus(page)
+		},
+	),
+	Saving: variantsListState(
+		{ 'POST /v1/image-variants': { status: 201, hang: true } },
+		async (page) => {
+			await openVariantForm(page)
+			await fillVariantForm(page, heroForm)
+			await pressVariantFormButton(page, 'Add variant')
+			await page.mouse.move(0, 0)
+		},
+	),
+	'Save error': variantsListState(
+		{ 'POST /v1/image-variants': { status: 500 } },
+		async (page) => {
+			await openVariantForm(page)
+			await fillVariantForm(page, heroForm)
+			await pressVariantFormButton(page, 'Add variant')
+			await page.getByText("Couldn't save the variant").waitFor()
+			await page.mouse.move(0, 0)
+		},
+	),
+	'Edit: pristine': variantsListState({}, openEditHero),
+	'Edit: dirty': variantsListState({}, async (page) => {
+		await openEditHero(page)
+		await variantField(page, 'quality').fill('70')
+		await blurFocus(page)
+	}),
+	'Unsaved changes': variantsListState({}, async (page) => {
+		await openEditHero(page)
+		await variantField(page, 'quality').fill('70')
+		await pressVariantFormButton(page, 'Cancel')
+		await page.getByRole('alertdialog').waitFor()
+	}),
+	'PNG: no quality': variantsListState({}, async (page) => {
+		await openVariantForm(page)
+		await fillVariantForm(page, { ...heroForm, quality: undefined })
+		await pickVariantFormat(page, 'PNG')
+		await blurFocus(page)
+	}),
+}
+
 export const visualStates: Record<string, Record<string, VisualState>> = {
 	activity: activityStates,
 	profile: {
@@ -4233,6 +4566,7 @@ export const visualStates: Record<string, Record<string, VisualState>> = {
 			steps: submitAcceptInvite('lea', 'limewash2026'),
 		},
 	},
+	'image-variants': variantsStates,
 	media: { ...mediaStates, ...mediaPurgeStates },
 	'media-picker': pickerStates,
 }