HMAC Generator

Compute HMAC signatures with SHA-1, SHA-256, SHA-384, or SHA-512 from a message and secret key. 100% in-browser via Web Crypto — nothing leaves your machine. Output in hex or Base64.

Inputs

Message

Secret key

Algorithm

Key encoding

Output

Hex

Base64

Common uses: API request signing (AWS, Stripe webhooks), JWT HS256, OAuth 1.0, message integrity checks.