Your browser can do it.
Free PDF, image, video, text and developer tools that run on your device. Nothing gets uploaded.
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First use downloads ~300 MB (LibreOffice engine). On a slow network this can take a few minutes.
After that, it's cached on your device. Subsequent conversions start in about 2 seconds and never upload your file.
Drop your file here
or click to browse
All files
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or paste with ⌘V
filename
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Nothing has left this page since you opened the tool. Show network activity
The browser enforces this: the site’s security policy only lets the page talk to the code libraries’ servers and an anonymous usage counter (tool name, file type, size range). A request carrying your file to anywhere else would be blocked before it left.
Check it yourself: open your browser’s developer tools, go to the Network tab, and run the tool. Or turn off Wi-Fi once the tool has loaded; it keeps working.