DEVELOPER UTILITIES / LOCAL TOOL
HMAC Generator
Sign messages in your browser.
HOW IT WORKS
Authenticating a message
HMAC combines a secret key with a hash function so a recipient with the same key can detect changed content.
Limits to keep in mind
A leaked or weak key defeats the guarantee, and this page does not manage key rotation.
A PRACTICAL WORKFLOW
Use the result carefully.
01Enter a message to produce a local HMAC demonstration. Use a trusted secret in real applications.
02Run the utility and inspect the complete output.
03Use a random secret, keep it separate from the message and compare tags safely in production code.
COMMON QUESTION
Is HMAC encryption?
No. It proves knowledge of a shared secret and message integrity; it does not conceal the message.