HMAC Generator
Create and verify HMAC signatures with SHA-256, SHA-512 and more. Ideal for testing webhooks and API requests. Private and free.
Computed with your browser’s Web Crypto. The key and message never leave this page.
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How to use HMAC Generator
- Paste the message and the secret key (text, hex or Base64).
- Pick the hash — SHA-256 is the usual choice.
- Copy the signature, or paste one to verify a webhook.
Privacy
Runs entirely in your browser. Nothing you enter or open here is uploaded.
Questions
How do I verify a webhook?
Use the exact raw request body as the message and your webhook secret as the key, then compare with the signature header (e.g. sha256=…).