About BoxTool
BoxTool exists to make the small, daily computing tasks easier: converting units, generating a QR code, formatting some JSON, splitting a PDF. We pick tools by what people actually search for, build them well, and ship them in six languages.
Who runs BoxTool
BoxTool is designed, built, and maintained by an independent software engineer based in South Korea. It is not a content farm: every tool on this site was written by hand, one at a time, and every guide that accompanies a tool was written after actually using that tool and verifying what it does.
How we build and test our tools
Each tool starts as a real problem someone searches for. We implement it in plain client-side JavaScript so it runs entirely in your browser, then check its output against published formulas, reference implementations, or authoritative sources before it goes live.
- Every tool is exercised before release. We load each page, run the tool with realistic inputs, and confirm the result — not just that the page renders.
- The whole catalog is re-audited regularly. We periodically re-test all tools in an automated browser to catch regressions, and fix what we find.
- Guides state real limitations. When a tool has a constraint — an offline data snapshot, a browser-specific behavior, a precision limit — the guide on that page says so plainly instead of overselling.
Our principles
- Privacy by default. Almost every tool runs in your browser — we never see your data.
- No signup. Open, click, done.
- Speed. Pages load in under a second, even on slow connections.
- Accuracy. Our calculators use published formulas, with sources cited where it matters.
Corrections
If a tool gives you a result that looks wrong, we want to know. Write to us via the contact page with the tool name and the input you used; we reproduce every report and publish the fix. Several of the improvements on this site started as a reader pointing out a mistake.
How we pay the bills
Google AdSense pays for hosting and development. We never sell user data — we couldn't, because we don't have any.
Get in touch
Questions, corrections, or a tool you wish existed? Reach us through the contact page — we read everything.