🛡️ 2FA Authenticator

Generate 2FA / TOTP authentication codes from your secret key. Compatible with Google Authenticator, Authy, and other 2FA apps. 100% client-side — your secret never leaves your browser.

Enter your 2FA Secret Key:

📋 Supported Formats:
JBSWY3DPEHPK3PXP — Raw Base32 secret key
otpauth://totp/Label?secret=JBSWY3DPEHPK3PXP&issuer=ServiceName — Full otpauth URI
JBSWY3DPEHPK3PXP — With optional spaces or dashes

🔑 Save Multiple Accounts

Add multiple 2FA secrets to quickly generate codes for different accounts. Saved in your browser only (localStorage).

About 2FA Authenticator

Two-Factor Authentication (2FA) adds an extra layer of security to your online accounts. When enabled, you need both your password and a temporary code generated by an authenticator app to log in.

How TOTP Works:

Secret Key: A shared secret between you and the service (stored in your authenticator app)
Time Step: The current time is divided into 30-second intervals
HMAC-SHA1: The secret key and time are combined using HMAC-SHA1
6-Digit Code: A 6-digit code is extracted from the hash result

Common 2FA Apps:

Google Authenticator — By Google, works on Android & iOS
Authy — Multi-device sync, cloud backup
Microsoft Authenticator — Deep Windows integration
1Password — Password manager with 2FA support
YubiKey — Hardware security key

Security Tips:

Always save your backup codes in a safe place
Consider using a hardware key for high-value accounts
Never share your secret keys with anyone
Use this tool only on trusted devices
Clear browser data if using on a shared computer