DocToolsKit is a collection of free file utilities built on one rule: your files never leave your device.
Every tool on this site runs entirely in your browser. Images are decoded by your device's own codecs, HEIC photos by a WebAssembly build of libheif, and PDFs by PDF.js, pdf-lib and jsPDF — the same open-source libraries that power desktop software. When you press Download, the result is handed from your browser's memory straight to your disk. There is no server-side processing, no queue, and no copy of your file anywhere but where you put it.
Because the architecture makes it nearly free to run. Server-based converters pay for CPU time and bandwidth on every file; browser-based tools pay neither, so there is no reason to charge, cap file sizes, or ask for an account. The site is supported by unobtrusive advertising.
Nothing — no signup, no email, no watermark. If a tool saved you time, the best thanks is a link shared with someone else who needs it.
Spotted a bug or need a tool that is missing? The fastest way to reach the project is through the feedback link in the site footer of any page.