The AntiUpload blog
Plain, honest writing about file privacy — where your documents really go when you use online tools, how to check for yourself, and how to get the job done without uploading anything.
EngineeringHow we built true PDF text editing in the browser (and what Adobe still does better)
Most free “edit PDF” tools paint over your text and leave the original in the file. We built the real thing — content-stream rewriting, paragraph reflow, scan editing — entirely in your browser. The full technical story, including the privacy bug our own tests caught.
July 3, 2026 · 7 min readBenchmarksWe tested our in-browser OCR on real scanned documents — every number, including where we lose
Most OCR tools claim accuracy; none show their data. We benchmarked ours on synthetic scan conditions and a public corpus of real 1990s fax-era forms — and published everything: the 100% rows, the 70% rows, and the fixes our own benchmark forced on us.
July 3, 2026 · 8 min readPrivacyWhy I stopped trusting “free” online file tools — and built my own
A five-minute job took forty minutes and three watermarks. Why “free” online file tools rarely are — and a one-minute way to spot a genuinely free, private one.
June 25, 2026 · 5 min readAI & PrivacyIs it safe to put confidential or work documents into AI chatbots?
Pasting a contract or client file into an AI chatbot is fast — but where does that document go, and who can see it? The real risks, the account tier that changes everything, and safer ways to get AI help.
June 18, 2026 · 8 min readPrivacyIs it safe to upload files to online converters?
Most online file tools make you upload your document to their server first. Here is what that actually means for your privacy — and a one-minute way to check where your file really goes.
July 6, 2026 · 7 min read