HMAC Generator

Choose SHA-256, SHA-384, or SHA-512 and calculate a keyed HMAC entirely in the browser using Web Crypto.

Hash

Output

Secret key

Message

—Key and message stay in this browser tab.

All sensitive values on this page are processed in your browser. Do not treat a browser utility as a replacement for an audited password manager, hardware security device, or application-specific security review.

How to use this HMAC Generator

Generate HMAC values for text using a local secret key. Enter your values above and the result is calculated directly in your browser. No account is required.

Fast answer, clear inputs

This tool is built around one job: give the answer quickly without forcing a signup or hiding the result. Related tools are linked nearby when the next calculation or conversion is useful.