Is it safe? Check for yourself.

Do not take our word for it. Open your browser's developer tools (F12), Network tab, then convert a file. You will see the engine download (once) and Google Analytics requests, which measure the page. What you will never see is a request carrying your file: sort by size, and nothing anywhere near the size of your file leaves.

Second test: load the page, turn off Wi-Fi, convert. It works. A service that uploaded your files could not.

Third: the code that runs is the code you can see. No conversion server means no possible leak, no retention, no subprocessor.

The engines are reference open-source software (FFmpeg, libavif, libjxl, mozjpeg, pdf.js, SheetJS, libarchive) compiled to WebAssembly and served from our own domain with verified integrity.