HMAC Generator
Generate HMAC signatures with the Web Crypto API — nothing is sent to a server
About this tool
Generate HMAC signatures (SHA-1, SHA-256, SHA-384, SHA-512) from a message and secret key using the Web Crypto API. Output in hex or Base64, computed entirely in your browser. HMAC Generator runs in the browser on DevTools. There is no signup, and your input stays on this device unless the tool explicitly performs a live network lookup.
What this tool does not do
- HMAC Generator is a free in-browser utility, not a hosted API. It does not keep server-side history and is not a substitute for production verification in your own stack.
How do I use this tool?
How do I use HMAC Generator?
Open HMAC Generator, enter or paste your input, and copy the result. The page works without an account.
Related guides
Encryption Tools Explained: AES vs BCrypt vs HMAC
Three cryptographic primitives developers constantly confuse — reversible encryption (AES), password hashing (BCrypt), and message signing (HMAC). What each one is for, and how to pick correctly.
JSON Web Tokens (JWT) Explained: A Complete Guide for Developers
What a JWT is, how the header.payload.signature structure works, which claims matter, and how to sign and verify tokens securely — with examples you can run in your browser.
Generating Secure API Tokens and Secrets in the Browser
How to create cryptographically strong tokens, sign payloads with HMAC, and encrypt data with AES — all client-side, with nothing sent to a server.
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