HMAC Generator
Generate an HMAC signature for a message with a secret key.
Computed locally using the Web Crypto API. Your secret is never sent anywhere.
Overview
Computes an HMAC (Hash-based Message Authentication Code) — used to verify both the integrity and authenticity of a message, since producing a valid HMAC requires knowing the secret key.
How to use it
- 1Enter the secret key.
- 2Choose a hash algorithm.
- 3Enter the message.
- 4The HMAC updates automatically.
Tips
- Only use this for testing and debugging — never paste a real production signing secret into any web-based tool.