TOTP Codes
Turn a 2FA secret into live six-digit codes, or mint a new secret and otpauth link for your own service.
Secret
Base32, or paste a whole otpauth:// link
Kept in memory only — nothing is written to storage.
Settings
Check a code
Accepts the previous and next step, like a real server
What this is
TOTP (RFC 6238) hashes a shared secret together with the current 30-second counter and truncates the result to six digits. Same secret plus same clock equals the same code, which is why an authenticator works offline — and why a device with the wrong time fails to log in.