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.

Also works with passwords: securely store and retrieve username/password credentials.

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.

Add a trusted and secure Sign In With Google button to your app.

Users sign-in to a Google account to use when visiting your site or using your app.

Google maintains the account for your users; your app uses their Google account instead of creating and maintaining new accounts on your domain.

Use OAuth 2.0 and our Client libraries to quickly and securely call Google APIs.

Google supports common OAuth 2.0 scenarios such as those for web server, client-side, installed, and limited-input device applications.

Get your app verified and ready for production.

Integrate your services and APIs with Google, share media and data with Google Assistant, Smart Home, YouTube and more. After obtaining user consent securely link an individual Google account with an account on your platform with OAuth 2.0 standard flows.

Improve user privacy with custom scopes, sharing only the data necessary for a specific use case. Increase user trust by clearly communicating how Google uses this data.

The Blockstore API lets apps save user credentials without the complexity or security risk associated with saving user passwords.

Programmatically save and retrieve credentials, and automatically sign users in across devices and websites with Smart Lock for Passwords.

Enable forms on apps to use the device's autofill utilities.

Enable forms on web pages to use the browser's autofill utilities.

Use the SMS Retriever API to verify users by SMS, without the need for manual input of a verification code.

Verify phone numbers on the Web with the WebOTP API, and help users with one-time passwords received through SMS.

Firebase Authentication makes building secure authentication easy, providing sign-in and on-boarding for your users on all their devices. It provides backend services to securely authenticate users, paired with easy-to-use client SDKs. It can authenticate users using passwords and federated identity provider credentials. Firebase Authentication also provides UI libraries to implement a full authentication experience in your app.

Identity Platform is a customer identity and access management (CIAM) platform that helps organizations add identity and access management functionality to their applications, protect user accounts, and scale with confidence on Google Cloud.