HMAC Generator

What is HMAC?

An HMAC generator: combine a message with a secret key to produce a keyed hash used to authenticate API requests, webhooks, and messages.

How it works

Web Crypto imports the key material and signs the message with the HMAC algorithm you select; the signature is returned as hex.

1. Enter your input. Type or paste your input into the field above — the tool responds instantly.
2. Review the result. Output updates live as you type. Everything runs entirely in your browser.
3. Copy or download. Use the Copy button to grab the result, or Download to save it as a file.

Examples

Realistic sample

Paste or type any realistic input — the tool computes the result locally and instantly.

Common mistakes

Expecting a server round-trip

Nothing is uploaded — every tool in this category runs entirely in your browser.