UnderJoy's web-based authenticator lets you generate 2FA and MFA codes for Google, GitHub, AWS, Microsoft, and hundreds of other services directly in your browser — no app store, no install, nothing to download. Open authapp.underjoy.in, sign in with the same account you use on mobile, and your authenticator codes are ready in seconds.
It's built for exactly the moments a phone-only authenticator falls short: locked out of your phone, working from a shared or borrowed computer, or simply preferring to keep your codes in a browser tab alongside your other logins. Every authenticator you add on the web authenticator syncs automatically with the Android and Windows apps, and vice versa, so you're never stuck with an out-of-date code on any device.
Like the rest of the UnderJoy Authenticator suite, your codes are generated locally in your browser — no third-party API ever sees your secret keys — and an optional PIN lock keeps your session protected even on a shared browser.
Open the Web Authenticator →
Want to see if we're doing great for you? Install in your phone and sign-in to the app. Add authenticator by Scanning the QR code or by manually entering the below secret key. Once you've validated the authentication, feel free to delete this test client from your app anytime!
