diff --git a/e2e/specs/collections.spec.ts b/e2e/specs/collections.spec.ts
new file mode 100644
index 0000000000..6961818844
--- /dev/null
+++ b/e2e/specs/collections.spec.ts
@@ -0,0 +1,269 @@
+import type { Page } from '@playwright/test';
+import { test, expect } from '../fixtures';
+import { dismissCookieBanner } from '../helpers/cookie-banner';
+import { createTestUser, TestUser, loginAs } from '../helpers/auth';
+
+test.describe.serial('collection lifecycle', () => {
+  let testUser: TestUser;
+  let page: Page;
+  let sketchName1: string;
+  let sketchName2: string;
+  let collectionName: string;
+
+  test.beforeAll(async ({ browser, request }) => {
+    testUser = await createTestUser(request);
+
+    // A single page shared across this describe.serial block (instead of the
+    // per-test `page` fixture) so each test below can build on the previous
+    // one's state (same sketch/collection, still logged in).
+    page = await browser.newPage();
+    await page.addInitScript(() => {
+      // eslint-disable-next-line @typescript-eslint/no-explicit-any
+      (window as any).__REDUX_DEVTOOLS_EXTENSION__ = () => {};
+    });
+
+    await page.goto('/login');
+    await dismissCookieBanner(page);
+    await loginAs(page, testUser);
+  });
+
+  test.afterAll(async () => {
+    await page.close();
+  });
+
+  test('can create a collection', async () => {
+    // Save the initial sketch
+    const editor = page.locator('.editor-holder');
+    await editor.click();
+
+    await page.keyboard.press('Control+S');
+    await expect(page.getByText('Sketch saved.')).toBeVisible({
+      timeout: 10_000
+    });
+
+    // Get the sketch name. ProjectName.jsx gives this button a static
+    // "Edit sketch name" aria-label (unlike the collection name editor,
+    // which uses the dynamic default), so we search by that and read the
+    // sketch name from its text content instead.
+    const name = await page
+      .getByRole('button', { name: 'Edit sketch name' })
+      .textContent();
+    expect(name).toBeTruthy();
+    sketchName1 = name ?? '';
+
+    // Open the collections page
+    await page.getByRole('menuitem', { name: testUser.username }).click();
+    await page.getByRole('menuitem', { name: 'My Collections' }).click();
+
+    await expect(page.getByText('No Collections.')).toBeVisible({
+      timeout: 5_000
+    });
+
+    // Create a new collection
+    await page
+      .getByRole('button', { name: 'Create collection', exact: true })
+      .click();
+
+    collectionName = await page
+      .getByRole('textbox', { name: 'name' })
+      .inputValue();
+    // The form's submit button has the same accessible name as the toolbar
+    // button that opened it (still present behind the overlay), so the role
+    // query is scoped to the form itself to disambiguate.
+    await page
+      .locator('form')
+      .getByRole('button', { name: 'Create collection', exact: true })
+      .click();
+
+    // Confirm we're on the new collection page
+    await expect(
+      page.getByRole('button', { name: collectionName })
+    ).toBeVisible({ timeout: 10_000 });
+    await expect(page.getByText('No sketches in collection')).toBeVisible();
+  });
+
+  test('can add sketches to a collection', async () => {
+    await page.getByRole('button', { name: 'Add Sketch', exact: true }).click();
+
+    await expect(page.getByText(sketchName1)).toBeVisible({ timeout: 5_000 });
+
+    await page
+      .getByRole('button', { name: 'Add to collection', exact: true })
+      .first()
+      .click();
+
+    await page
+      .getByRole('button', { name: 'Close Add Sketch overlay' })
+      .click();
+
+    // Confirm the sketch is in the collection
+    const sketchesTable = page.getByRole('table');
+    await expect(
+      sketchesTable.getByRole('link', { name: sketchName1 })
+    ).toBeVisible({ timeout: 5_000 });
+
+    await sketchesTable.getByRole('link', { name: sketchName1 }).click();
+
+    // Create a new sketch to add to the collection
+    await expect(page.locator('.editor-holder')).toBeVisible({
+      timeout: 5_000
+    });
+
+    await page.getByRole('menuitem', { name: 'File' }).click();
+    await page.getByRole('menuitem', { name: 'New' }).click();
+
+    const editor = page.locator('.editor-holder');
+    await editor.click();
+
+    await page.keyboard.press('Control+S');
+    await expect(page.getByText('Sketch saved.')).toBeVisible({
+      timeout: 10_000
+    });
+
+    const name = await page
+      .getByRole('button', { name: 'Edit sketch name' })
+      .textContent();
+    expect(name).toBeTruthy();
+    sketchName2 = name ?? '';
+
+    // Add the new sketch to the collection
+    await page.getByRole('menuitem', { name: 'File' }).click();
+    await page
+      .getByRole('menuitem', { name: 'Add to Collection', exact: true })
+      .click();
+
+    await expect(page.getByText(collectionName)).toBeVisible({
+      timeout: 5_000
+    });
+
+    await page
+      .getByRole('button', { name: 'Add to collection', exact: true })
+      .first()
+      .click();
+
+    // The item's toggle flips to "Remove from collection" once the add lands.
+    // Asserting on that rather than the toast, which only shows for 1500ms.
+    await expect(
+      page.getByRole('button', { name: 'Remove from collection', exact: true })
+    ).toBeVisible({ timeout: 10_000 });
+
+    // Close the overlay
+    await page
+      .getByRole('button', { name: 'Close Add to collection overlay' })
+      .click();
+
+    await page.getByRole('menuitem', { name: testUser.username }).click();
+    await page.getByRole('menuitem', { name: 'My Collections' }).click();
+
+    // Verify the collection has 2 sketches
+    await expect(
+      page.getByRole('row', { name: collectionName }).getByRole('cell').nth(2)
+    ).toHaveText('2');
+  });
+
+  test('can rename a collection', async () => {
+    // Open the dropdown
+    await page
+      .getByRole('button', { name: 'Toggle Open/Close collection options' })
+      .first()
+      .click();
+
+    // Click Rename
+    await page.getByRole('menuitem').filter({ hasText: 'Rename' }).click();
+
+    // The collection name becomes an input — fill it. No aria-label on this
+    // one, so it's scoped to the table to disambiguate from the page's
+    // "Search collections..." textbox.
+    const renameInput = page.getByRole('table').getByRole('textbox');
+    await renameInput.click();
+    await renameInput.fill('renamed-collection');
+    await renameInput.press('Enter');
+
+    collectionName = 'renamed-collection';
+
+    // Verify the new name appears
+    await expect(page.getByRole('link', { name: collectionName })).toBeVisible({
+      timeout: 5_000
+    });
+
+    await page.getByRole('link', { name: collectionName }).click();
+
+    // Both sketches should still be in the collection after the rename
+    const sketchesTable = page.getByRole('table');
+    await expect(
+      sketchesTable.getByRole('link', { name: sketchName1 })
+    ).toBeVisible({ timeout: 5_000 });
+    await expect(
+      sketchesTable.getByRole('link', { name: sketchName2 })
+    ).toBeVisible({ timeout: 5_000 });
+    await expect(page.getByText('2 sketches')).toBeVisible();
+  });
+
+  test('can remove a sketch from a collection', async () => {
+    await page.getByRole('link', { name: sketchName1 }).click();
+
+    // Confirm we're back in the editor and the sketch is loaded
+    await expect(page.locator('.editor-holder')).toBeVisible({
+      timeout: 5_000
+    });
+    await expect(
+      page.getByRole('button', { name: 'Edit sketch name' })
+    ).toHaveText(sketchName1, { timeout: 5_000 });
+
+    await page.getByRole('menuitem', { name: 'File' }).click();
+    await page
+      .getByRole('menuitem', { name: 'Add to Collection', exact: true })
+      .click();
+
+    await expect(page.getByText(collectionName)).toBeVisible({
+      timeout: 5_000
+    });
+
+    await page
+      .getByRole('button', { name: 'Remove from collection', exact: true })
+      .first()
+      .click();
+
+    // The toggle flips back to "Add to collection" once the removal lands.
+    // Asserting on that rather than the toast, which only shows for 1500ms.
+    await expect(
+      page.getByRole('button', { name: 'Add to collection', exact: true })
+    ).toBeVisible({ timeout: 10_000 });
+
+    // Close the overlay
+    await page
+      .getByRole('button', { name: 'Close Add to collection overlay' })
+      .click();
+
+    await page.getByRole('menuitem', { name: testUser.username }).click();
+    await page.getByRole('menuitem', { name: 'My Collections' }).click();
+
+    // sketch1 was removed but sketch2 is still in the collection
+    await expect(
+      page.getByRole('row', { name: collectionName }).getByRole('cell').nth(2)
+    ).toHaveText('1');
+  });
+
+  test('can delete a collection', async () => {
+    // Accept the confirmation dialog
+    page.on('dialog', (dialog) => dialog.accept());
+
+    // Open the dropdown for the collection
+    await page
+      .getByRole('button', { name: 'Toggle Open/Close collection options' })
+      .first()
+      .click();
+
+    // Click delete
+    await page.getByRole('menuitem').filter({ hasText: 'Delete' }).click();
+
+    // Verify collection no longer exists in the table
+    await expect(
+      page.getByRole('link', { name: collectionName })
+    ).toHaveCount(0, { timeout: 5_000 });
+
+    await expect(page.getByText('No collections.')).toBeVisible({
+      timeout: 5_000
+    });
+  });
+});