Most "private" PDF tools still upload your file. I tested one that doesn't — here's exactly how to verify it yourself

We delete your file after an hour" isn't a privacy guarantee — it's a policy you can't verify.

Real test: open DevTools → Network tab → use any "private" PDF tool. Watch your file leave your device the second you click compress.

Built PDF Engineer to fail that test — zero requests, ever, even on 500MB files. Try the DevTools check on it yourself: https://chromewebstore.google.com/detail/nchciajmojfogknljmfndimemagcgegc?utm_source=item-share-cb

What else have you tested that fails?