TOTP Code Generator — 2FA Testing Tool
Generate time-based one-time passwords from a TOTP secret key. Enter your base32 secret, choose a period and digit length, and get the current and next codes with a live countdown timer. Useful for testing and debugging 2FA integrations.
How to Use TOTP Code Generator — 2FA Testing Tool
How to Use the TOTP Code Generator
Step 1: Enter Your Secret
Paste your base32-encoded TOTP secret into the Secret Key field. This is the secret shown during 2FA setup — usually displayed as a QR code with a text fallback like JBSWY3DPEHPK3PXP.
Base32 uses only the characters A–Z and the digits 2–7. Spaces and padding characters (=) are ignored automatically.
Step 2: Match Your App Settings
Set the Time Period and Code Length to match what your service configured:
| Setting | Default | Notes |
|---|---|---|
| Period | 30 seconds | Most services — Google, GitHub, AWS, etc. |
| Period | 60 seconds | Some enterprise or legacy systems |
| Digits | 6 | Standard for most authenticator apps |
| Digits | 8 | Higher-security implementations |
When in doubt, use 30 seconds and 6 digits — these are the RFC 6238 defaults.
Step 3: Read the Live Codes
- Current Code — The active TOTP code right now. Copy and use it immediately.
- Countdown ring — Shows how many seconds remain before the code rotates. Green = plenty of time, amber = 10s left, red = 5s or less.
- Next Code — The code that will activate next. Highlighted when fewer than 5 seconds remain so you know what to expect.
Common Uses
- Testing 2FA login flows — Verify that your server correctly validates TOTP codes during integration testing.
- Debugging clock drift — If a code is rejected, compare the generated code with your authenticator app. Mismatches indicate a time sync issue on the server.
- Recovering a 2FA secret — If you have the original base32 secret but lost access to your authenticator app, paste it here to generate valid codes.
- Verifying TOTP library output — Cross-check codes generated by your backend TOTP library against this tool to confirm correctness.
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