About hexnook

hexnook is a growing collection of developer tools — from a JSON formatter and JWT decoder to a color converter, password generator, and text diff checker — that run entirely in your web browser. No sign-up, no rate limit, no "processing…" spinner waiting on a server.

Why is it free?

Every tool here runs using JavaScript already built into your browser — JSON.parse, the Web Crypto API, native RegExp — not a server we operate. Because there's no per-request infrastructure cost to pass on, the site is instead supported by advertising.

Nothing you paste ever leaves your device

Whatever you type or paste into a tool — JSON, a JWT, a file for Base64 encoding — is only ever processed in your browser's own memory. We can't see it, because we never receive it. You can verify this yourself by opening your browser's network tab while using any tool here.

Feedback

If you have feedback, a bug report, or a tool you'd like to see added, see our Contact page.