Input
key=secret / msg=hello / HMAC-SHA256
Output
Hex or Base64 signature string
Developer Tools
HMAC Signature Tester — SHA Digest and Verify
Compute SHA digests and HMAC signatures with Web Crypto in your browser for common SHA algorithms. Useful when debugging payments, webhooks, and request-body signature checks with data kept local.
HMACSHASignatures
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开发工具
HMAC Signature Tester
Compute SHA digests and HMAC signatures with Web Crypto in your browser for common SHA algorithms. Useful when debugging payments, webhooks, and request-body signature checks with data kept local.
Use cases
- Verify third-party gateway signatures
- Check webhook header HMAC values
- Compare frontend and backend digests for the same body
How to use
- Choose algorithm and enter secret plus message
- Compute HMAC or hash output
- Compare with the expected server value
Example input and output
FAQ
Is the secret uploaded?
No. Web Crypto runs locally; secrets and message bodies are not sent to a server.
Which algorithms are supported?
Common SHA-1/256/384/512 and matching HMAC variants—see the page options.
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