diff --git a/web/src/lib/components/MobileAppDownload.svelte b/web/src/lib/components/MobileAppDownload.svelte
index 19ee9e10..d43e47ad 100644
--- a/web/src/lib/components/MobileAppDownload.svelte
+++ b/web/src/lib/components/MobileAppDownload.svelte
@@ -2,6 +2,7 @@
   import { onMount } from 'svelte';
   import { Download, Smartphone } from 'lucide-svelte';
   import { api } from '#lib/api/client.js';
+  import { formatBytes } from '#lib/utils/bytes.js';
   import SettingsGroup from '#lib/components/settings/SettingsGroup.svelte';
   import SettingRow from '#lib/components/settings/SettingRow.svelte';
 
@@ -20,11 +21,6 @@
 
   let info = $state<Info | null>(null);
 
-  function formatSize(bytes: number): string {
-    if (bytes < 1024 * 1024) return `${(bytes / 1024).toFixed(0)} KB`;
-    return `${(bytes / 1024 / 1024).toFixed(1)} MB`;
-  }
-
   onMount(async () => {
     try {
       const body = await api.get<Partial<WireInfo>>('/api/client/version');
@@ -44,7 +40,7 @@
   <SettingsGroup title="Android app">
     <SettingRow
       label="Minstrel for Android"
-      hint="{info.version}{info.sizeBytes > 0 ? ` · ${formatSize(info.sizeBytes)}` : ''} · sign in with this account"
+      hint="{info.version}{info.sizeBytes > 0 ? ` · ${formatBytes(info.sizeBytes)}` : ''} · sign in with this account"
     >
       <Smartphone size={18} strokeWidth={1.5} class="text-text-secondary" aria-hidden="true" />
       <a
diff --git a/web/src/lib/components/WantCandidates.svelte b/web/src/lib/components/WantCandidates.svelte
index 8d48e404..0b1a55de 100644
--- a/web/src/lib/components/WantCandidates.svelte
+++ b/web/src/lib/components/WantCandidates.svelte
@@ -10,6 +10,7 @@
   import { errMessage } from '#lib/api/errors.js';
   import { pushToast } from '#lib/stores/toast.svelte.js';
   import { relativeTime } from '#lib/utils/relativeTime.js';
+  import { formatBytes } from '#lib/utils/bytes.js';
   import type { Candidate, CandidateVerdict, GrabResult } from '#lib/api/types.js';
 
   // Every release a want's last search found (M502 #5521), with the verdict
@@ -41,14 +42,9 @@
     blocked: 'bg-surface-hover text-text-muted'
   };
 
-  function size(bytes: number): string {
-    if (bytes <= 0) return '';
-    if (bytes >= 1e9) return `${(bytes / 1e9).toFixed(1)} GB`;
-    return `${Math.max(1, Math.round(bytes / 1e6))} MB`;
-  }
-
   function meta(c: Candidate): string {
-    const parts = [c.format || 'format not stated', size(c.size_bytes)];
+    // An indexer that states no size sends 0.
+    const parts = [c.format || 'format not stated', c.size_bytes > 0 ? formatBytes(c.size_bytes) : ''];
     parts.push(c.seeders === 1 ? '1 seeder' : `${c.seeders} seeders`);
     if (c.indexer) parts.push(c.folded_from.length ? `${c.indexer} +${c.folded_from.length}` : c.indexer);
     return parts.filter(Boolean).join(' · ');
diff --git a/web/src/routes/collection/duplicates/+page.svelte b/web/src/routes/collection/duplicates/+page.svelte
index 38cb6aa7..5fc371a3 100644
--- a/web/src/routes/collection/duplicates/+page.svelte
+++ b/web/src/routes/collection/duplicates/+page.svelte
@@ -12,6 +12,8 @@
   import { errMessage } from '#lib/api/errors.js';
   import { pushToast } from '#lib/stores/toast.svelte.js';
   import { relativeTime } from '#lib/utils/relativeTime.js';
+  import { formatBytes } from '#lib/utils/bytes.js';
+  import { formatDuration } from '#lib/media/duration.js';
   import type {
     AdminDuplicateGroup,
     AdminDuplicateMember,
@@ -134,16 +136,6 @@
     return `Same recording · ${match}% match`;
   }
 
-  function sizeLabel(bytes: number): string {
-    return `${(bytes / 1_000_000).toFixed(1)} MB`;
-  }
-
-  function durationLabel(sec: number): string {
-    const m = Math.floor(sec / 60);
-    const s = sec % 60;
-    return `${m}:${s.toString().padStart(2, '0')}`;
-  }
-
   function countLabel(n: number, one: string, many: string): string {
     return n === 1 ? `1 ${one}` : `${n} ${many}`;
   }
@@ -440,7 +432,7 @@
                   </div>
                 </div>
                 <div class="shrink-0 space-y-0.5 text-right text-xs text-text-muted">
-                  <div>{m.file_format.toUpperCase()} · {sizeLabel(m.file_size)} · {durationLabel(m.duration_sec)}</div>
+                  <div data-testid="member-file">{m.file_format.toUpperCase()} · {formatBytes(m.file_size)} · {formatDuration(m.duration_sec)}</div>
                   <div data-testid="member-history">{historyLabel(m)}</div>
                 </div>
               </li>
diff --git a/web/src/routes/collection/duplicates/duplicates.test.ts b/web/src/routes/collection/duplicates/duplicates.test.ts
index c40efbb0..14dcbd76 100644
--- a/web/src/routes/collection/duplicates/duplicates.test.ts
+++ b/web/src/routes/collection/duplicates/duplicates.test.ts
@@ -132,6 +132,17 @@ describe('admin duplicates', () => {
     expect(history).toEqual(['2 likes · 14 plays', 'no likes or plays']);
   });
 
+  // Size and length come from the shared formatters (M505).
+  test('each copy shows its format, size and length', () => {
+    const group = response().groups[0];
+    group.members = [member('www-01'), member('www-02', { file_size: 812_000, duration_sec: 3665 })];
+    renderWith(response({ groups: [group] }));
+    expect(screen.getAllByTestId('member-file').map(text)).toEqual([
+      'MP3 · 6.9 MB · 3:35',
+      'MP3 · 812 KB · 1:01:05'
+    ]);
+  });
+
   // The badge must sit on the proposed survivor, not merely appear somewhere.
   test('the keep badge is on the survivor row', () => {
     renderWith(response());
diff --git a/web/src/routes/collection/missing/+page.svelte b/web/src/routes/collection/missing/+page.svelte
index 749d8009..b32a4634 100644
--- a/web/src/routes/collection/missing/+page.svelte
+++ b/web/src/routes/collection/missing/+page.svelte
@@ -12,6 +12,7 @@
   import { errMessage } from '#lib/api/errors.js';
   import { pushToast } from '#lib/stores/toast.svelte.js';
   import { relativeTime } from '#lib/utils/relativeTime.js';
+  import { formatDuration } from '#lib/media/duration.js';
   import { coverUrl } from '#lib/media/covers.js';
   import { needsYou, searched, wantStatus } from '#lib/wanted/wantStatus.js';
   import WantCandidates from '#lib/components/WantCandidates.svelte';
@@ -43,12 +44,6 @@
     return n === 1 ? '1 track' : `${n} tracks`;
   }
 
-  function durationLabel(sec: number): string {
-    const m = Math.floor(sec / 60);
-    const s = sec % 60;
-    return `${m}:${s.toString().padStart(2, '0')}`;
-  }
-
   // What happens to these is set under Acquisition (#5607); the line above
   // the list says what it is now, since this is where the question comes up.
   let policy = $state<ReacquisitionSettings | null>(null);
@@ -269,7 +264,7 @@
                     never played
                   {/if}
                 </span>
-                <span class="shrink-0 text-xs text-text-muted">{durationLabel(t.duration_sec)}</span>
+                <span class="shrink-0 text-xs text-text-muted" data-testid="missing-track-length">{formatDuration(t.duration_sec)}</span>
               </li>
             {/each}
           </ul>
diff --git a/web/src/routes/collection/missing/missing.test.ts b/web/src/routes/collection/missing/missing.test.ts
index ff35bf80..0b117fc7 100644
--- a/web/src/routes/collection/missing/missing.test.ts
+++ b/web/src/routes/collection/missing/missing.test.ts
@@ -147,6 +147,19 @@ describe('/collection/missing', () => {
   });
 
   // The deciding fact for whether a missing file is worth chasing.
+  // The page's lengths come from the shared formatter: an hour-long track
+  // reads 1:01:05, not 61:05 (M505).
+  test('each track shows its length, hours and all', () => {
+    const long = structuredClone(response);
+    long.groups[1].tracks[0].duration_sec = 3665;
+    renderWith(long);
+    expect(screen.getAllByTestId('missing-track-length').map((el) => el.textContent?.trim())).toEqual([
+      '3:05',
+      '3:05',
+      '1:01:05'
+    ]);
+  });
+
   test('distinguishes a played track from one never played', () => {
     renderWith(response);
     expect(screen.getByText(/last played 2d ago/)).toBeTruthy();
diff --git a/web/src/routes/settings/account/account.test.ts b/web/src/routes/settings/account/account.test.ts
index 8e5fc666..86c77c56 100644
--- a/web/src/routes/settings/account/account.test.ts
+++ b/web/src/routes/settings/account/account.test.ts
@@ -87,7 +87,7 @@ describe('Settings › Account', () => {
     const { container } = render(AccountPage);
     const download = await screen.findByRole('link', { name: /download/i });
     expect(download).toHaveAttribute('href', '/api/client/apk');
-    expect(screen.getByText(/2026\.10\.10\.2300 · 30\.0 MB/)).toBeInTheDocument();
+    expect(screen.getByText(/2026\.10\.10\.2300 · 31\.5 MB/)).toBeInTheDocument();
     const titles = Array.from(container.querySelectorAll('h2')).map((h) => h.textContent?.trim());
     expect(titles[0]).toBe('Android app');
   });