HMAC•Client-Side Processing
HMAC Generator
Generate real HMAC signatures with SHA-256, SHA-384, or SHA-512 and hexadecimal or Base64 output.
Developer workbench
⌘ / Ctrl + Enter to runConfigure. Run. Inspect.
Secrets remain in memory. JWT signing and verification use HS256; decoded claims are not automatically trusted.
20 input bytes
Output
How to Use HMAC Generator
01
Enter the message and signing secret.
02
Choose the hash algorithm and output encoding.
03
Run the signature calculation.
04
Copy or download the signature.
Frequently Asked Questions
Where are HMACs used?
HMACs are widely used in AWS signature v4, Stripe webhooks, and GitHub webhook event validations.
Related Developer Tools
Explore more free client-side developer utilities in this category