Developer Tools
HMAC Generator
Generate HMAC-SHA256 / SHA-1 / SHA-512 signatures from a message and secret key.
Files processed in your browser
Your files never leave your device. No upload, no servers.
About HMAC Generator
HMAC Generator computes a Hash-based Message Authentication Code (HMAC) using a shared secret and a hash algorithm. Used by webhook signing (Stripe, GitHub, Slack), API request signing (AWS, Twilio), and JWT HS256 tokens.
Uses the WebCrypto subtle API. Runs in your browser — your secret never leaves the page.