HMAC generator
Compute a keyed HMAC signature (SHA-1/256/384/512) for a message using a secret key.
How to use
HMAC generator lets you compute a keyed HMAC signature (SHA-1/256/384/512) for a message using a secret key. Enter your text and the digest is computed instantly with the Web Crypto API for each supported algorithm.
Hashing runs entirely in your browser via Web Crypto — nothing you enter is uploaded or logged. It's completely free, with no sign-up, no watermarks and no limits on how often you use it.
Examples
Paste any string to see its hash update live; identical input always produces the identical digest.
Once hMAC generator shows your output, use the copy or download button to grab it — no retyping.
Frequently asked questions
Is HMAC generator free to use?
Yes. HMAC generator is completely free with no sign-up, no watermarks and no usage limits.
Is my data private?
Yes. Hashing runs entirely in your browser via Web Crypto — nothing you enter is uploaded or logged.
Does HMAC generator work on mobile?
Yes. It works in any modern browser on desktop, tablet or phone, and keeps working offline once the page has loaded.