Free 2FA Code Generator — Online TOTP Authenticator
Generate 6-digit two-factor authentication codes right in your browser. Paste your secret key, get your TOTP code instantly — no app install, no signup.
Find this key next to the QR code when you enable 2FA on Google, Facebook, GitHub, Discord, or any service.
🔒 Private by design: codes are generated locally in your browser. Your secret key is never sent to any server.
How to Use the 2FA Code Generator
- Copy your secret key. When you turn on two-factor authentication for an account, the service shows a QR code plus a text secret key. Copy that key.
- Paste it above and hit Generate. The tool computes a fresh 6-digit TOTP code using the same standard (RFC 6238) as Google Authenticator and Authy.
- Enter the code before the timer runs out. Codes refresh every 30 seconds. If one expires, just use the next one.
What Is 2FA?
Two-factor authentication (2FA) adds a second check after your password: a short-lived code that only you can generate. Even if someone steals your password, they cannot log in without your current 2FA code. The most common method is TOTP — time-based one-time passwords — where a 6-digit code changes every 30 seconds, generated from a secret key only you hold.
Is It Safe to Use an Online 2FA Generator?
This generator runs entirely in your browser using the Web Crypto API. Your secret key never leaves your device — there is no server involved, nothing is stored, and nothing is transmitted. That said, treat secret keys like passwords: do not paste them on untrusted computers, and keep backup codes for your accounts in a safe place.
Frequently Asked Questions
What is a 2FA code?
A 2FA code is a short temporary password — usually 6 digits — generated from your secret key and the current time. It proves you hold the registered device or key, adding a second layer of security beyond your password.
Why does my code change every 30 seconds?
TOTP codes are derived from the current time in 30-second windows. The short lifespan means a stolen code is useless within seconds, which is exactly what makes 2FA strong against replay attacks.
Will these codes match Google Authenticator?
Yes. This tool implements the same open TOTP standard (RFC 6238) used by Google Authenticator, Microsoft Authenticator, Authy, and 1Password. For the same secret key, all of them produce identical codes.
My code was rejected. What went wrong?
The usual causes: the secret key was copied with extra spaces or missing characters, or your device clock is out of sync. Make sure your system time is set to automatic, re-copy the key carefully, and try the next code after the refresh.
Do you store my secret key?
No. Everything happens in your browser memory. The key is never sent anywhere, never saved, and disappears when you close or refresh the page.