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DevToys
Encode & decode

HMAC generator

Sign messages with a shared secret

How to use / Notes

How to use

  1. Enter the message and the shared secret.
  2. Choose the hash algorithm (e.g. SHA-256).
  3. Copy the generated HMAC.

Notes

  • Computed in the browser; the secret is never sent anywhere.
  • Output casing and encoding (hex / Base64) must match the verifying side.