HMAC
HMAC Generator
Generate HMAC-SHA256/384/512 with a secret key. For request signing, webhooks, and auth.
Runs entirely in your browser · Your input is never transmitted
MESSAGE
0 BReady
HMAC · SHA-256
Enter key—
How to use
- Enter a secret key.
- Paste the message.
- Pick the hash size. Copy the HMAC hex.
Frequently asked
What's HMAC used for?
Signing API requests (Stripe, AWS v2, Slack webhooks), validating webhooks, and proving message integrity with a shared secret.