Google Identity Services
Google Identity Services is our new cross-platform sign-in SDK for Web and Android apps, supporting and streamlining multiple types of credentials.
Sign In With Google
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.
OAuth 2.0 implicit and authorization code flows for web apps