Encoding & Security

HMAC Generator

Compute HMAC with SHA-256/384/512.

100% browser No upload Free forever

Secret key Message

Algorithm Output

HMAC

Common questions

FAQ

1 Is the secret sent anywhere?

No — the key never leaves your browser. WebCrypto computes the HMAC locally.

Encode or decode Base64 text.

Percent-encode or decode URLs.

Decode JWT header and payload (no signature verification).

Generate MD5, SHA-1, SHA-256, SHA-512 hashes.

Create strong random passwords.