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HMAC Generator
Compute HMAC signatures with modern SHA algorithms using a secret key and message payload directly in your browser.
How to use this tool
- Choose the HMAC hash algorithm and enter your shared secret.
- Paste the message payload to sign.
- Copy or download the generated hex digest for verification workflows.
Common tasks
- Recreate webhook signatures during integration debugging.
- Validate SDK signing implementations across environments.
- Compare expected and actual digests for API auth troubleshooting.
Security guidance
- Use the exact same algorithm, secret, and payload bytes as the upstream system.
- Normalize encoding (UTF-8) and whitespace to avoid mismatched signatures.
- Rotate shared secrets regularly and avoid exposing them in logs.
FAQ
- Why is MD5 not offered?
- The tool follows modern Web Crypto support and provides SHA-based HMAC options only.
- Does this send my secret to a server?
- No. HMAC generation uses local browser cryptography APIs.
- How do I verify an incoming signature?
- Generate a digest with matching inputs and compare it against the provided signature value.
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