HMAC (Keyed-Hash Message Auth) Generator

Generate HMAC-SHA256, HMAC-SHA512 signatures with secret keys for API authentication.

Processing Architecture: Client-Side (Processed locally in your web browser with zero server uploads)

How to Use HMAC (Keyed-Hash Message Auth) Generator

Step 1: Enter Message Payload
Input the raw webhook payload or request body string.
Step 2: Enter Secret Key
Input your shared secret key.
Step 3: Choose Hash Algorithm
Select SHA-256, SHA-512, or SHA-384.
Step 4: Copy HMAC
Copy resulting hexadecimal or Base64 signature.

Key Features & Capabilities

Compliant with RFC 2104 Keyed-Hashing for Message Authentication
Hexadecimal and Base64 output encodings
Supports webhook verification for Stripe, GitHub, and Shopify

Frequently Asked Questions

What is HMAC used for?

HMAC allows APIs and webhooks to verify both data integrity and authenticity using a shared cryptographic secret.

Does this support Base64 output encoding?

Yes, you can export signatures formatted as hex digests or Base64 encoded strings.

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