HMAC Generator
Generate a Hash-based Message Authentication Code (HMAC) from a message and a secret key, using the algorithm of your choice. The key can be UTF-8, hex or base64 — pick the encoding to match how it's stored. Output is shown in both hex and base64 so you can paste straight into whichever API your stack expects. Computation uses WebCrypto's subtle.sign and runs entirely in your browser — your key and message never leave the device.
Privacy
Runs entirely in your browser — nothing is sent to any server.
Cost
Free. No sign-up, no watermark.
Type
Crypto
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Frequently asked
Is HMAC Generator free to use?
Yes. HMAC Generator is completely free with no sign-up, no watermark, and no usage limits. Toolsly does not charge for any of its tools.
Do my files and data stay private?
Yes — HMAC Generator runs entirely in your browser using your device's CPU. Files and text are never uploaded to our servers, so your data stays private.
How does HMAC Generator work?
Open HMAC Generator, paste or fill in the input fields, and the result updates instantly. Everything runs in your browser — no upload, no waiting.
Which browsers does HMAC Generator support?
Any modern browser works — Chrome, Firefox, Safari, and Edge on desktop and mobile. HMAC Generator uses standard web APIs and does not require any plugin, extension, or sign-up.