Message + key
Hello / secret
HMAC-SHA256 Hex
0cc692f2177b42b6e5cd82488ee6c5d526a007c571e7de1fec07c1e2b1dfa2e2
Encoding & Decoding
HMAC Generator - API Signature Digests
Generate an HMAC locally from a message and key with SHA-1/256/384/512, outputting Hex and Base64. Useful for API signing and webhook verification checks.
HMACSignatureHash
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HMAC Generator
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Use cases
- Debug request signatures for APIs
- Check webhook callback signatures
- Verify message authentication logic
How to use
- Enter the message and secret key
- Choose the HMAC algorithm
- Copy the Hex or Base64 result
Example input and output
FAQ
How does HMAC differ from a plain hash?
A plain hash digests content only. HMAC also uses a key, so it checks integrity and that the signer holds the key.
Is the key uploaded?
No. Message and key are computed locally with Web Crypto. Local processing omits message, key, and signature bodies.
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