HMAC Generator

Create or verify HMAC signatures with SHA-256, SHA-384, or SHA-512 locally.

Input stays in this browser

Create or verify HMAC signatures locally with the browser Web Crypto API.

Hash algorithm

Secret

Message

Expected signature

Optional. Paste a Base64 signature to verify.

Base64 signature

How it works

Enter a shared secret and message. Optionally paste an expected Base64 signature to verify it.

Keys and messages remain in memory in your browser.