HMAC Signature Generator Online
Free online HMAC tool that signs messages with a secret for webhook and API authentication tests.
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Free online HMAC tool that signs messages with a secret for webhook and API authentication tests.
How it works
This tool computes an HMAC for a message using a secret key and hash algorithm. It’s commonly used for webhook verification and API authentication.
Example
Key: secret Message: hello Output: (HMAC digest)
FAQ
Is HMAC the same as hashing?
HMAC uses a secret key with a hash function to produce a signature, while hashing alone does not use a secret.
Should I output hex or Base64?
Depends on the API requirement. Many systems use hex; some use Base64. Match the documentation.
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