HMAC Generator Online — Free & Private

A free edge API by formatho.com, privacy-first developer tools.

Free, no signup, runs entirely in your browser — your data never leaves your device.

🔓 Free🔒 Zero tracking🚫 No key storage⚡ Edge-fast

Usage

curl "https://hmac-generator-formatho.filesformatho.workers.dev/api?data=hello&key=secret&alg=SHA-256"
curl -X POST "https://hmac-generator-formatho.filesformatho.workers.dev/api" -H "Content-Type: application/json" \
  -d '{"data":"hello","key":"secret","alg":"SHA-512","encoding":"base64"}'

Parameters: data (message, required), key (secret, required), alg (SHA-256 default; SHA-1, SHA-384, SHA-512), encoding (hex default or base64). Returns the HMAC digest plus metadata. Full reference: /api endpoint.

Privacy-first: HMAC is computed in-memory at the edge with the Web Crypto API; your message and secret are never logged, stored, or sent anywhere else.

Full browser tool

HMAC signing entirely client-side: HMAC Generator on formatho.com.

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