AuthPin for Google

Pin a Google account to each service, so you always land in the right one.

Juggling personal, work, and school accounts? AuthPin adds the correct authuser to Google URLs by domain — no more wrong-account surprises.

Features

• Per-domain accounts — pin a different account to Gmail, Drive, YouTube, and more.
• Auto-redirect — sets authuser the moment you open a configured domain.
• Any Google hostname — type it directly, e.g. notebooklm.google.com.
• Loop-safe — guards against redirect loops.
• Backup & restore — export your rules to JSON and import them back.
• Private — settings stay in your browser; nothing is transmitted, sold, or shared.

Install

Get it on the Chrome Web Store — works in Chrome and other Chromium browsers (Brave, Edge, Opera, …).

Prefer to build it yourself? Build and load it manually.

Usage

1. Click the icon and toggle it on.
2. Add a rule: a Google hostname + the account for it.
3. Save. That service now opens with your pinned account.

Example: mail.google.com → work@gmail.com, youtube.com → personal@gmail.com.

Works across *.google.com, *.youtube.com, and *.ai.google.

Not the Chrome Web Store. chromewebstore.google.com is out of scope: Chrome blocks every extension from running on the Web Store, so authuser can't be pinned there. The popup rejects a rule for it.

Privacy

Everything stays on your device — nothing transmitted, sold, or shared; no tracking, no remote servers. See the full Privacy Policy.

Contributing

Developer setup, project structure, and scripts live in CONTRIBUTING.md.

License

MIT © 2026 emretepedev