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HMAC Calculator

Generate HMAC signatures for webhook payload verification. Supports SHA-256, SHA-1, SHA-384, and SHA-512 with hex or base64 encoding.

Algorithm

SHA-256SHA-1SHA-384SHA-512

Secret Key

Output Encoding

hexbase64

HMAC Signature

Payload

How HMAC Webhook Verification Works

The webhook provider signs the payload using a shared secret
The signature is sent in an HTTP header (e.g., X-Hub-Signature-256)
You recompute the HMAC using the same secret and payload
Compare your computed signature with the received one

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