AuthFill is your one-click solution for verifying email addresses across the web. Say goodbye to searching your inbox for verification codes or links.

Whether you need to verify your email or reset your password for the hundredth time, AuthFill makes it painless. Just click the AuthFill icon and you’re verified!

Whether you're team Gmail, Outlook, or using an old-school custom domain, AuthFill has your back.*

Your credentials and emails are never stored anywhere except your own device.**

AuthFill is fully open-source, so anyone can peek under the hood, suggest improvements, or just admire the code.

• git
• NodeJS v22.14.0
• pnpm v8.15.6

1. Clone the repository

git clone [email protected]:authfill/authfill.git
cd authfill

1. Add your enviroment variables

cp .env.example .env

2. Install the dependencies

pnpm install

3. Start the development server

pnpm run dev

4. Load the unpacked extension

Chrome (or chromium based browsers):

1. Open chrome://extensions/
2. Enable the "Developer mode" in the top right
3. Press "Load unpacked" in the top left
4. Navigate to the AuthFill source code and select the apps/extension/dist folder

Firefox:

1. Add BROWSER=firefox to your .env file.
2. Restart the server by running pnpm run dev again
3. Enter about:debugging in the Firefox search bar
4. Navigate to the "This Firefox" tab
5. Press "Load Temporary Add-on"
6. Navigate to the apps/extension/dist folder and select the manifest.json file inside apps/browser/build

If you prefer to run your own proxy server, see the Self-Hosting Guide for deployment instructions.

*AuthFill supports any email provider with IMAP access and plain-text password authentication. This includes Gmail, Outlook, and most custom domain email services.

**Due to a technical limitation of browser extensions, AuthFill has to temporarily proxy data through our servers to establish the IMAP connection and fetch your emails. However, your credentials and emails are never permanently stored and remain strictly confined to the processing step. Everything else stays local on your device. You can also self-host the proxy for full control. Read more in our Privacy Policy at https://authfill.com/privacy