Every "free online PDF tool" uploads your files to a server. I built one that doesn't — and here's the technical breakdown.
The Privacy Problem
Try this: Google "compress pdf online free" and use the first 5 results. Each one uploads your PDF to their server, processes it, and gives you a download link. Your file sits on their server — anywhere from 1 hour to 14 days.
The privacy policies tell the story:
Smallpdf: "We retain your files for 1 hour"






