OTP Generator
Generate Time-based One-Time Passwords (TOTP) for two-factor authentication.
About TOTP
Time-based One-Time Password (TOTP) is a standard algorithm for generating temporary codes used in two-factor authentication.
The codes change every 30 seconds (by default) and are derived from a shared secret key using HMAC-SHA1.
This implementation follows RFC 6238 and is compatible with Google Authenticator, Authy, and similar apps.
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Editorial Note
MyCalcBuddy Editorial Team
This page is maintained as an educational calculator reference.
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Formula Source: Standard Mathematical References
by Various
🔄Last reviewed: May 2026
✓Formula checks are based on standard references and internal QA review.