IT Consulting
Illustration of a key and a message combining into an HMAC signature

HMAC Generator

Enter a key and a message to compute the HMAC. Runs entirely in your browser — a key is a credential, so nothing here is ever sent anywhere.

ℹ️ About HMAC
  • HMAC combines a secret key with a hash function so the result proves both the message's integrity and that whoever produced it knows the key — used for things like signing webhook payloads and API requests.
  • HMAC-MD5 and HMAC-SHA-1 are still used in some legacy systems, but prefer HMAC-SHA-256 or HMAC-SHA-512 for anything new.
  • Runs entirely client-side — nothing you type here is ever sent anywhere. The JSON API below is a separate, opt-in endpoint for scripts.
💻 Show API usage example (cURL) 
curl -sS -X POST https://devops.majbase.com/hmac-generator/api \
    -F "key=secret" -F "message=hello world"

Returns {"md5", "sha1", "sha256", "sha512"}, or {"error": "..."}.