HMAC SHA-256 Generator
Generate HMAC SHA-256 signatures for webhooks, API authentication, and message integrity. Enter your secret key and message — both are processed locally in your browser.
Key and message are hashed locally; nothing is uploaded.
Your generated secrets and hashes are processed locally in your browser whenever possible and are not stored on our servers.
Overview
Generate HMAC SHA-256 signatures for webhooks, API authentication, and message integrity. Enter your secret key and message — both are processed locally in your browser.
Benefits
- Standard HMAC-SHA256
- Secret key never uploaded
- Hex signature output
- Webhook-friendly
Use Cases
- Stripe/GitHub-style webhooks
- API request signing
- Integrity verification
- Debugging signature mismatches
Users Also Use
How to Use
- Enter secret key and message.
- Click Generate HMAC.
- Compare with your server-computed signature.
FAQ
- What is HMAC SHA-256?
- HMAC combines a secret key with a hash function (SHA-256) to produce a message authentication code.
- Is my secret key sent to the server?
- No. HMAC is computed entirely with Web Crypto in your browser.
- Why does my HMAC not match?
- Check encoding (UTF-8), key whitespace, and whether the server uses hex vs Base64 output.
About HMAC SHA-256 Generator
HMAC SHA-256 is the backbone of signed webhooks and API requests. This hmac sha256 generator helps developers verify signatures during integration without exposing secrets to third-party websites.