HMAC Generator
Compute the HMAC (authenticated hash) of a message with your secret key. Supports SHA-256, SHA-512, SHA-1 and MD5. All local, nothing sent.
Input
HMAC with SHA-256 is the current standard (HS256, JWT, API keys). MD5 is included for legacy compatibility.
HMAC signature
Type the message to sign it.
Related tools
Frequently asked questions
What is HMAC?+
It's a keyed hash that verifies both the integrity and authenticity of a message. Used in API signatures and webhooks.