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Google Identity Services is our new cross-platform sign-in SDK for Web and Android apps, supporting and streamlining multiple types of credentials.

Seamless user authentication for sign-in and sign-up flows

Add a personalized and customizable sign-up or sign-in button to your website.
Sign up new users with just one tap, without interrupting them with a sign-up screen. Users get a secure, token-based, passwordless account on your site, protected by their Google Account.
Sign users in automatically when they return to your site on any device or browser, even after their session expires.

User authorization for Google APIs

The Google Identity Services JavaScript library helps you to quickly and safely obtain access tokens necessary to call Google APIs. Your web application, running in the user's browser, loads this library to complete either the OAuth 2.0 implicit flow, or to initiate the authorization code flow which then finishes on your backend platform.
Authentication Authorization