HMAC Generator
Create HMACs locally for text using SHA-1/256/384/512. No uploads, no tracking.
Message
HMAC
HMAC generation runs locally with the Web Crypto API. Keys never leave the page.
Standard algorithms
Supports HMAC with SHA-1, SHA-256, SHA-384, and SHA-512.
Private by design
Everything runs in your browser. Secrets are never sent or stored.
Copy or download
Grab the HMAC in lowercase or uppercase, or download as a text file.