Two-Factor Auth Tester
Generate TOTP codes from a secret key (RFC 6238). Verify codes and test your 2FA setup in real time.
Test with: JBSWY3DPEHPK3PXP (common test secret)
- Uses HMAC-SHA1 with a shared secret key
- Time-based counter changes every 30 seconds
- Produces a 6-digit code (RFC 6238)
- Same algorithm used by Google Authenticator, Authy, etc.
- All computation happens locally in your browser
How to Use Two-Factor Auth Tester
- 1
Enter a secret key
Paste the TOTP secret key or scan a QR code.
- 2
Generate a code
See the current time-based one-time password generated.
- 3
Verify the code
Test that the generated code matches your authenticator app.
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