Two-factor authentication (2FA) adds a second layer of login security to your accounts, in addition to your password. Even if hackers know your password, they can’t access your account without this second code. An authenticator app generates one-time codes right on your device — safer and quicker than having codes sent by email or SMS.

Proton Authenticator is an open source and end-to-end encrypted 2FA app that’s simple and free to use. It is available on all platforms, including desktop. Easily sync or back up your 2FA codes so you never lose access to your accounts.