HMAC Generator / Validator
About HMAC Generator / Validator
Generate or verify HMAC signatures for UTF-8 payloads using SHA-256, SHA-384, or SHA-512. Inspect hexadecimal signatures locally with your chosen secret key.
How to use this tool
Select generate or verify, enter the UTF-8 payload and secret key, and choose the hash algorithm. Verification also needs the expected hexadecimal signature.
What to know
Both sides must use identical payload bytes and the same key encoding. A plain hash and an HMAC are not interchangeable.