HMAC Generator
Generate a keyed HMAC signature over a message using a secret key.
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Hash Studio
How to Use the HMAC Generator
Enter a message and a secret key to compute an HMAC signature, entirely in your browser using the Web Crypto API.
- 01
Pick an Algorithm
HMAC-SHA1, SHA256, SHA384, or SHA512.
- 02
Enter Message & Secret
Your secret stays in this browser tab only — never logged, stored, or sent anywhere.
Frequently Asked Questions
Answers about this tool.
Is my secret key stored anywhere?
No. It exists only in memory for this tab and is cleared when you navigate away.
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