About iDuckConvert
57 free converters that run in your browser, from the makers of iDuckPDF and iDuckIMG.
What happens to your files
Every tool runs in your browser. Your files are opened, changed and saved on your own device, and they are not uploaded to our servers. Our host, Cloudflare, sees the same ordinary web requests for our pages that any website sees. Please do not rely on that alone for anything truly secret: check any tool you trust, and close the tab when you are done.
Who runs it
iDuckConvert is made and run by Basic App Company. It is a sister site ofiDuckPDF, which has free PDF tools, and iDuckIMG, which has free image tools, and shares their look. PDF conversions live on iDuckPDF and picture conversions that already exist on iDuckIMG are linked, not copied.
What it costs
Nothing. There is no sign-up and no watermark on your results. We may show ads to cover the running costs, and we will keep them away from the upload area and the download button. See Donate for ways to help.
How it is built
The pages are plain static files made with Astro, with small Preact pieces for the tools. Audio and video use ffmpeg.wasm, a copy of ffmpeg compiled to WebAssembly. Its engine file (about 30 MB) is fetched once from a public CDN and then cached by your browser; your files are never sent there. Spreadsheets use SheetJS, and the rest is small open-source code running on your device. Because everything runs on your device, big videos can be slow on an older phone.
Get in touch
The easiest way is the feedback form. To ask for a tool, useRequest a feature.