diff --git a/frontend/e2e/documents.spec.ts b/frontend/e2e/documents.spec.ts
index 8e77e603..a597d0a1 100644
--- a/frontend/e2e/documents.spec.ts
+++ b/frontend/e2e/documents.spec.ts
@@ -633,24 +633,30 @@ test.describe('Document editing — tags (J3)', () => {
 // ── J4: Create a brand-new tag via TagInput ────────────────────────────────
 //
 // Types a tag name that does not exist yet, confirms creation with Enter, and
-// verifies the tag chip persists after save.
+// verifies the tag chip persists after save AND after a full page reload.
 
 test.describe('Document editing — new tag creation (J4)', () => {
-	const baseURL = process.env.E2E_BASE_URL ?? 'http://localhost:3000';
-	let newTagDocHref: string;
-	const newTagName = `E2E-Tag-${Date.now().toString(36)}`;
+	let newTagDocId: string;
+	const stamp = Date.now().toString(36);
+	const newTagName = `E2E-Tag-${stamp}`;
 
 	test.beforeAll(async ({ request }) => {
 		const createRes = await request.post('/api/documents', {
-			multipart: { title: 'E2E New Tag Test' }
+			multipart: { title: `E2E New Tag Test ${stamp}` }
 		});
 		if (!createRes.ok()) throw new Error(`Create document failed: ${createRes.status()}`);
 		const doc = await createRes.json();
-		newTagDocHref = `${baseURL}/documents/${doc.id}`;
+		newTagDocId = doc.id;
 	});
 
-	test('user types a new tag name, presses Enter, saves, and sees the chip', async ({ page }) => {
-		await page.goto(`${newTagDocHref}/edit`);
+	test.afterAll(async ({ request }) => {
+		if (newTagDocId) await request.delete(`/api/documents/${newTagDocId}`);
+	});
+
+	test('user types a new tag name, presses Enter, saves, and tag persists after reload', async ({
+		page
+	}) => {
+		await page.goto(`/documents/${newTagDocId}/edit`);
 		await page.waitForSelector('[data-hydrated]');
 
 		const tagInput = page.getByPlaceholder('Schlagworte hinzufügen...');
@@ -665,8 +671,19 @@ test.describe('Document editing — new tag creation (J4)', () => {
 
 		await page.getByRole('button', { name: 'Speichern', exact: true }).click();
 
+		// Detail page after redirect — tag link must be visible.
 		await expect(page).toHaveURL(/\/documents\/[^/]+$/);
-		await expect(page.getByText(newTagName)).toBeVisible({ timeout: 5_000 });
+		await expect(page.locator('a[href*="?tag="]', { hasText: newTagName })).toBeVisible({
+			timeout: 5_000
+		});
+
+		// Reload to verify the tag survived the round-trip (not just client-side state).
+		await page.reload();
+		await page.waitForSelector('[data-hydrated]');
+		await expect(page.locator('a[href*="?tag="]', { hasText: newTagName })).toBeVisible({
+			timeout: 5_000
+		});
+
 		await page.screenshot({ path: 'test-results/e2e/document-new-tag-created.png' });
 	});
 });