Users signed into Google on their device or browser get expedited authentication on your app or site.

Returning users sign in automatically or with one tap or click.

You even have the option to let users create new accounts with a single tap or click.

Open source and industry standard authentication.

Passkeys are a safer and easier replacement for passwords.

Google's OAuth 2.0 APIs conform to the OpenID Connect specification, are OpenID Certified, and can be used for both authentication and authorization.

While we normally recommend the use of Sign In With Google for user authentication, in some situations you may want to call our APIs directly.

These APIs are listed here for historical reference.