HMAC Generator
Sign a message with HMAC using a secret key.
Message
HMAC output
About the HMAC Generator
Generate an HMAC signature for a message using a secret key and your choice of SHA hash algorithm, computed with the Web Crypto API. Useful for verifying webhook payloads or API request signing.
Examples
Sign a message
message + keyOutput
hex/base64 HMAC signatureRelated tools
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Generate SHA-1/256/384/512 hashes of text.
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Encode or decode text using RFC 4648 Base32.
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Compute SHA-1/256/384/512 digests of a local file.
Frequently asked questions
Read more
- Understanding JWT: structure, claims and safe verification
What is actually inside a JSON Web Token, which claims matter, and why decoding a JWT is not the same as verifying it.
- Choosing a hashing algorithm: MD5 vs SHA-1 vs SHA-256 vs bcrypt
Checksums, digital fingerprints and password storage all use 'hashing' — but the right algorithm depends entirely on the job.
Version 1.0.0 · Updated 2026-08-06 · Runs entirely in your browser