UtilityKit is a growing collection of free online tools — JSON formatters, PDF mergers, image converters, calculators, regex testers, and more. Every tool runs in your browser when possible, so your data never leaves your device.

We're a small team of engineers who use these tools every day. Browser-only tools ship with zero server round-trips. Backend tools (PDF, image processing) run on our own infrastructure with strict size and time limits — no queues, no upsells, no watermarks.

No accounts. No tracking beyond aggregate analytics. No watermarks. No paid tier. If a tool can run in your browser, it does. Anything we build, we use ourselves.

Every tool starts as a single-purpose page with a clear goal and a strict size budget — under 100 KB initial load, mobile-friendly, no signup. We add a new tool when we hit a problem ourselves and can't find a free tool that does the one thing we need.

We don't have a public inbox yet. If you've found a bug or have feedback, the easiest way to reach us is through the issue tracker linked from each tool's footer.