2FA Live Authenticator

2FA Live is a free online TOTP (Time-based One-Time Password) generator that creates secure 2-factor authentication codes entirely in your web browser. It's compatible with any service that supports standard TOTP authentication.

Yes, absolutely! 2FA Live is 100% free with no limitations, no registration required, and no hidden fees. You can generate unlimited codes for unlimited accounts.

No account is needed. The tool works immediately when you visit the site - just paste your secret key and start generating codes.

Yes. All code generation happens locally in your browser using JavaScript and the Web Crypto API. Your secret keys never leave your device and are never sent to any server.

TOTP stands for Time-based One-Time Password. It's an algorithm that generates a unique code by combining a shared secret key with the current time. Codes change every 30 seconds, providing strong security against replay attacks.

We use the HMAC-SHA1 algorithm as specified in RFC 6238, which is the industry standard for TOTP authentication. This ensures compatibility with Google Authenticator, Microsoft Authenticator, Authy, and all major authenticator apps.

Any modern browser that supports the Web Crypto API, including Chrome 53+, Firefox 34+, Safari 10+, Edge 79+, and Opera 40+. This also includes mobile browsers on iOS and Android.

Yes! Once the page loads, all functionality works entirely offline since all calculations happen in your browser. You don't need an internet connection to generate codes after the initial page load.

This typically means the key contains invalid characters. Valid Base32 keys only contain uppercase letters A-Z and numbers 2-7. Check for: lowercase letters (convert to uppercase), extra spaces, incorrect characters, or typos.

Nowhere. Your keys exist only temporarily in your browser's memory while generating codes. When you close the tab or refresh the page, they are completely erased from memory. We never store them anywhere.

No more than they could with any authenticator app. The security depends on keeping your secret key confidential. Since we don't store keys, there's no central database to hack. However, ensure your device itself is secure with updated software.

For daily use, we recommend a dedicated authenticator app on your phone for convenience and reliability. This tool is best used as a backup when you can't access your phone or need to verify a key before entering it into your authenticator app.

If you lose both your authenticator device AND your recovery codes, you'll need to contact each service's support to disable 2FA and re-setup. This tool cannot recover lost secrets - you must have the original Base32 key from initial setup.

Common causes: 1) Your device's clock is out of sync - synchronize time automatically. 2) You're typing the wrong code - copy it directly. 3) The site's server time is off - wait 30 seconds and try the next code. 4) Wrong secret key - verify you copied the correct one.

This indicates JavaScript isn't working properly. Try: refreshing the page, disabling browser extensions that might block scripts, checking if JavaScript is enabled in your browser settings, or trying a different browser.

Many services let you regenerate 2FA secrets if something goes wrong. Go back to the service's security settings, disable 2FA, then re-enable it to get a new secret key. Make sure to save recovery codes this time!

Use the copy button to instantly copy the code to your clipboard, then paste it into the service. Most modern browsers and operating systems support keyboard shortcuts (Ctrl+V / Cmd+V) for pasting.

Base32 is an encoding scheme that represents binary data using 32 printable characters (A-Z and 2-7). It's used for TOTP secret keys because it's case-insensitive friendly and avoids confusing characters like 0/O or 1/I/L.

No. This tool only supports TOTP (time-based). HOTP uses a counter that increments with each use, while TOTP uses the current timestamp. Most modern services use TOTP exclusively.

Some services use 8-digit codes instead of the standard 6-digit format. This tool generates 6-digit codes by default. If a service requires 8 digits, you'll need to use their official authenticator app or a different tool.