Google Authenticator

What Google Authenticator does

Google Authenticator generates temporary verification codes for accounts protected by two-factor authentication. It suits anyone who wants an extra sign-in check beyond a password, including people managing email, work services, banking portals, social networks, and other online accounts.

How it works

Accounts can be added by scanning a QR code, which avoids typing a setup key by hand. The app then displays changing codes that are tied to the account’s security settings. Codes can be generated without a mobile or Wi-Fi connection, making the app useful when travelling or in places with limited connectivity.

Account access and device changes

Google Authenticator can sync codes with a Google Account, giving users a way to restore them if a phone is lost or replaced. It also supports transferring account entries between devices through QR codes. This can reduce the need to revisit every online service when moving to new hardware. Support for time-based and counter-based methods helps it work with different two-factor authentication setups.

Who it suits

The app is aimed at users who want a focused code generator rather than a broader password-management tool. Its main screen keeps verification codes available at a glance, with each code changing on a schedule and a visible countdown showing when the current one will expire.

Google LLC publishes Google Authenticator in the Tools category. It has a 3.85/5 rating from 640,343 reviews and has recorded 100,000,000+ installs. Those figures place it among the more widely used dedicated authenticator apps, although the rating also suggests that experiences are not uniform across its large user base.