ComfyToolkit
22 tools · 100% client-side

Dev tools,
made comfy.

Format, encode, sign, convert and inspect - 22 utilities that run entirely in your browser. Nothing you paste is uploaded, so a live token or a production payload stays on your machine.

Browse all tools
  • No account
  • No upload
  • No tracking
  • Works offline
Try it right here

Try any tool in your browser

This is the real tool code, running in your tab. Open the network panel and watch it stay empty.

Input · editable
1{"service":"checkout","retries":3,"tags":["prod","eu-west"],"healthy":true}
Formatted
1
0 network requests · computed in this tabOpen JSON Formatter
tools
22tools
bytes uploaded
0bytes uploaded
accounts required
0accounts required
runs offline
∞runs offline

Why use browser-based developer tools

  • Nothing leaves the tab

    No upload step, no server round-trip, no log of your input. Safe for production payloads, live tokens and files you have not published.

  • Works offline

    Installable as a PWA and cached by a service worker. Open it once and it keeps working without a connection.

  • Keyboard first

    One palette reaches every tool. Search by name, tag or keyword, hit enter, paste, done - without touching the mouse.

Most reached for

Popular tools

All 22 tools
Six groups

Browse by category

Ordered the way work tends to flow: parse and reformat data, encode or sign it, generate what you need, then reason about time, text and colour.

Questions

Before you paste anything

Is anything I paste uploaded to a server?

No. Every tool in ComfyToolkit computes in the browser tab you have open. Hashing, JWT decoding, formatting and colour conversion all run on your own machine, so a production payload or a live token never leaves it.

Does it work offline?

Yes. A service worker caches the app after the first visit, so tools keep working on a plane, on a locked-down network, or with the tab left open after the connection drops.

Do I need an account?

No account, no sign-in and no tracking of what you paste. Starred tools and per-tool inputs are kept in your browser local storage and never sent anywhere.

How do I find a tool quickly?

Press ⌘K (Ctrl+K on Windows and Linux) anywhere in the app to open the command palette and search all tools by name, tag or keyword.

Is it free?

Yes, every tool is free with no usage limits, no paid tier and no ads.

For the reasoning behind the tools - why UUID v7 indexes better than v4, why two contrast checkers disagree, why a Unix timestamp is ambiguous without its unit - read the developer guides.

Still looking for something?