HMAC Generator

Generate HMAC authentication signatures

Message

Secret Key

Algorithm

Output Encoding

What is HMAC Generator?

An HMAC generator creates keyed-hash message authentication codes using a secret key and a hash algorithm (SHA-256, SHA-512, etc.). HMACs verify both data integrity and authenticity, commonly used in API authentication, webhook signatures, and JWT tokens.

How to use

Step 1 — Enter your message and secret key.
Step 2 — Select the hash algorithm (SHA-256, SHA-384, or SHA-512) and output encoding (hex or Base64).
Step 3 — Copy the generated HMAC signature for use in API headers or webhook verification.

Result

Your payment API requires HMAC-SHA256 signed requests. Enter the request body as the message, your API secret as the key, and copy the resulting signature into the X-Signature header.

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