Your file stays on this device
This tool reads and processes the file in your own browser; nothing is uploaded to run it. That was checked, not assumed: every request a page makes during a real job was watched, and neither the file’s contents nor its name appeared in one.
Our host, Cloudflare, does add its own analytics and script-loading code to these pages, which sees ordinary request metadata — the same kind a web server already logs. The privacy page lists exactly what is served.
No file uploadsNo account requiredNo extension neededDisclosed host scripts