Enable Google Sign-In in Firebase

In one line: Open Authentication → Google in your Firebase project and set a project support email — your site can then use “Sign in with Google” to get the user’s identity, with no account system of your own.

Keywords: Firebase Authentication, Google sign-in, Sign-in method, project support email, OAuth

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Why use Firebase’s login?

To “know who the user is,” rolling your own accounts / passwords / OAuth is fiddly and error-prone. Firebase Authentication lets you wire up Google sign-in in one click — users log in with an existing Google account and you get their identity directly, skipping the whole credential system.

No Firebase project yet? Start with Create Your First Firebase Project.

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Step 1: Open Authentication

In the Firebase Console, type authentication in the top-left search box and open the Authentication product.

On your first visit you’ll see the product intro page — click Get started.

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Step 2: Pick and enable Google sign-in

In the Sign-in method list you’ll see Email/password, Google, Anonymous, Apple, and more. Select Google.

Flip the Enable toggle in the top-right, then click Save.

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Step 3: Set the project support email

🚨 A “set a project support email” warning appears

When enabling Google sign-in, Firebase asks for a public-facing project name and a support email — shown on the Google sign-in screen so users know who’s asking them to log in. Pick one of your Google emails from the dropdown; without it you’re stuck on this warning.

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Recap

• Firebase Authentication means no credential system of your own — Google sign-in in one click.
• Path: search Authentication → Get started → Sign-in method → Google → Enable → Save.
• Enabling Google sign-in requires a project support email, or you’re stuck on the warning.

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Next: With login on, register your site as a Web app and grab the SDK config it needs → Register a Web App in Firebase to Get the SDK Config