Developer
HMAC Generator
Generate HMAC-SHA256 or HMAC-SHA512 signatures from message and key.
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Frequently Asked Questions
Quick answers to common questions
Which algorithm should I use?+
SHA-256 for most APIs and webhooks. SHA-512 when you need a longer digest.
Hex or Base64 output?+
Hex is common in APIs and logs. Base64 is more compact.
Is the key stored?+
No. Key and message stay in your browser.
Same as JWT signing?+
JWT HS256 uses HMAC-SHA256. See JWT Generator for full tokens.