About OTP Generator

Generate and verify Time-based (TOTP) and HMAC-based (HOTP) One-Time Passwords

Generate time-based or counter-based one-time passwords from a Base32 secret and create an authenticator-compatible enrollment QR code.

Key features

• Security task Generate time-based or counter-based one-time passwords from a Base32 secret and create an authenticator-compatible enrollment QR code.
• Required material Enter or scan an otpauth secret, optionally including issuer and account name for the QR code.
• Parameters that must match Choose TOTP or HOTP, HMAC algorithm, digit count, time period, or counter so they exactly match the verifying service.
• Result and verification The page shows current, previous, and next codes where applicable, a countdown, and a local QR enrollment payload.

How to use OTP Generator

Follow this workflow to work with TOTP and HOTP codes safely and accurately.

1. Provide the required material Enter or scan an otpauth secret, optionally including issuer and account name for the QR code.
2. Match security parameters Choose TOTP or HOTP, HMAC algorithm, digit count, time period, or counter so they exactly match the verifying service.
3. Run the operation Run the operation locally, keep sensitive TOTP and HOTP codes out of logs and screenshots, and never assume a successful transformation proves secure deployment.
4. Verify before use The page shows current, previous, and next codes where applicable, a countdown, and a local QR enrollment payload.

Usage tips

• Treat the secret and enrollment QR code like a password; anyone who obtains either can generate future codes.
• Synchronize device time for TOTP and increment the counter consistently for HOTP.
• Confirm algorithm, digits, and period because many services use SHA-1, six digits, and 30 seconds but not all do.

Frequently asked questions