diff --git a/e2e/helpers/webkit.ts b/e2e/helpers/webkit.ts
new file mode 100644
index 0000000..9c98cd6
--- /dev/null
+++ b/e2e/helpers/webkit.ts
@@ -0,0 +1,29 @@
+import { test } from '@playwright/test';
+
+/**
+ * Skip a test that depends on persisting a Blob/File in IndexedDB when running on
+ * Playwright's WebKit.
+ *
+ * The client upload queue (`frontend/src/lib/upload-queue.ts`) stores the file itself in
+ * IndexedDB so a backgrounded or reloaded phone can resume the upload. Playwright's Linux
+ * WebKit build cannot store Blobs in IndexedDB at all — `put()` fails with
+ * "UnknownError: Error preparing Blob/File data to be stored in object store". Verified to
+ * be the harness, not the app: a Blob constructed in-page with `new Blob([bytes])` fails
+ * exactly the same way, while Chromium stores both that and a `setInputFiles` File fine.
+ * Real iOS Safari supports Blobs in IndexedDB, so this is NOT evidence of a bug on the
+ * platform these tests exist to protect.
+ *
+ * Any test that drives the composer (FAB → UploadSheet → /upload → submit) hits this,
+ * because `handleSubmit` awaits `addToQueue`, which throws before it can navigate.
+ *
+ * This is deliberately narrow. WebKit still runs every API-driven upload test, the whole of
+ * 01-auth, 03-feed and 06-export — including the keepsake download, which only WebKit can
+ * meaningfully verify. If Playwright's WebKit ever gains IndexedDB Blob support, delete this
+ * helper and the four call sites.
+ */
+export function skipIfNoIdbBlobs(browserName: string) {
+  test.skip(
+    browserName === 'webkit',
+    "Playwright's Linux WebKit cannot store Blobs in IndexedDB (harness limitation, not an iOS one) — the client upload queue can't be exercised there"
+  );
+}
diff --git a/e2e/specs/02-upload/burst-queue.spec.ts b/e2e/specs/02-upload/burst-queue.spec.ts
index 8b538d5..fb9762f 100644
--- a/e2e/specs/02-upload/burst-queue.spec.ts
+++ b/e2e/specs/02-upload/burst-queue.spec.ts
@@ -26,6 +26,7 @@
  * large fixture files.
  */
 import { test, expect } from '../../fixtures/test';
+import { skipIfNoIdbBlobs } from '../../helpers/webkit';
 import { FeedPage, UploadSheet } from '../../page-objects';
 import { mkdtempSync, copyFileSync, rmSync } from 'node:fs';
 import { join } from 'node:path';
@@ -100,7 +101,9 @@ test.describe('Upload — client queue under a burst', () => {
     guest,
     signIn,
     db,
+    browserName,
   }) => {
+    skipIfNoIdbBlobs(browserName);
     const g = await guest('BurstSerial');
     await signIn(page, g);
     await warmUploadChunk(page);
@@ -163,7 +166,9 @@ test.describe('Upload — client queue under a burst', () => {
     guest,
     signIn,
     db,
+    browserName,
   }) => {
+    skipIfNoIdbBlobs(browserName);
     const g = await guest('BurstResume');
     await signIn(page, g);
     await warmUploadChunk(page);
diff --git a/e2e/specs/02-upload/gallery-path.spec.ts b/e2e/specs/02-upload/gallery-path.spec.ts
index 3eaa5d8..6c9b3a6 100644
--- a/e2e/specs/02-upload/gallery-path.spec.ts
+++ b/e2e/specs/02-upload/gallery-path.spec.ts
@@ -4,6 +4,7 @@
  * IndexedDB queue resumption after refresh, and SSE `upload-processed`.
  */
 import { test, expect } from '../../fixtures/test';
+import { skipIfNoIdbBlobs } from '../../helpers/webkit';
 import { FeedPage, UploadSheet } from '../../page-objects';
 import { SseListener } from '../../helpers/sse-listener';
 import { join } from 'node:path';
@@ -49,7 +50,9 @@ test.describe('Upload — gallery path', () => {
     guest,
     signIn,
     db,
+    browserName,
   }) => {
+    skipIfNoIdbBlobs(browserName);
     // Previously fixme'd: the UI queue never fired a POST. Root cause was NOT a
     // navigation/blob timing quirk but an IndexedDB upgrade bug — the v1→v2
     // `upgrade` callback opened a *new* transaction, which throws during a
diff --git a/e2e/specs/02-upload/rejection-visible.spec.ts b/e2e/specs/02-upload/rejection-visible.spec.ts
index 0ecc2d9..39a51ac 100644
--- a/e2e/specs/02-upload/rejection-visible.spec.ts
+++ b/e2e/specs/02-upload/rejection-visible.spec.ts
@@ -13,6 +13,7 @@
  * queue row, no error text, and it never appeared in the feed.
  */
 import { test, expect } from '../../fixtures/test';
+import { skipIfNoIdbBlobs } from '../../helpers/webkit';
 import { FeedPage, UploadSheet } from '../../page-objects';
 import { join } from 'node:path';
 
@@ -25,7 +26,9 @@ test.describe('Upload — a rejected upload is surfaced', () => {
     host,
     guest,
     signIn,
+    browserName,
   }) => {
+    skipIfNoIdbBlobs(browserName);
     const g = await guest('RejectedUploader');
     await signIn(page, g);