TOTP / OTP Generator
Generate time-based one-time passwords (TOTP/RFC 6238) from a base32 secret. Shows the current OTP, countdown to next rotation, and a QR code URL for authenticator apps.
Found in your authenticator app QR code or manual entry key.
How TOTP Works
TOTP (Time-Based One-Time Password, RFC 6238) generates a short numeric code from a shared secret and the current time. The secret is a Base32-encoded key shared during setup (usually via QR code). Each code is valid for one time period (typically 30 seconds) and is computed as HMAC-SHA1(secret, floor(time/30)), then truncated to the required number of digits.
Security note
TOTP is used for multi-factor authentication. The secret key should be treated like a password - do not paste production secrets into web tools. This tool runs entirely in your browser and makes no network requests.