HMAC Generator — SHA-256 HMAC Online
Generate HMAC (Hash-based Message Authentication Code) signatures using SHA-256, SHA-512, SHA-384, or SHA-1. Enter a message and secret key — output in hex or Base64. Perfect for API signatures and webhook verification, all in your browser.
Your data never leaves your browser
Message
HMAC signature
About this tool
SHA-256/512/384/1Hex & Base64Secret keyWeb CryptoPrivate
How to use
- Enter the message to sign in the input panel.
- Provide your secret key and select the HMAC algorithm.
- Copy the signature in hex or Base64 format.
Examples
HMAC-SHA256
message + secret key
64-character hex digest