HMAC generator
Calculate a SHA-256 HMAC of an exact UTF-8 message and secret.
Result
Add your input, then select Calculate HMAC.
How to use it
Paste the exact message and signing secret. Get hexadecimal and Base64 signatures.
What to keep in mind
The secret is treated as UTF-8 text, not decoded from Base64 or hex. No timestamp or provider envelope is added.
Up to 2 MB per input, with smaller limits for complex operations. Clear removes the current input and result.
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