HMAC Signature Generator
Create cryptographic keyed signatures for APIs, webhooks, and security checks.
Processed locally in your browser — nothing is uploaded.
How to Use
- Enter your text message payload.
- Type or generate a secret key.
- Choose your preferred SHA algorithm and click Generate.
FAQ
What is an HMAC?
HMAC stands for Keyed-Hash Message Authentication Code. It combines a cryptographic hash function with a secret key to sign data.