Most "free" online PDF tools upload your files to their servers.

That means your medical documents, salary slips, financial records,

and confidential contracts are sitting on someone else's computer.

When I built ToolForge's 12 PDF tools, I made a hard decision: nothing

leaves the browser. Here's exactly how I built it and what I learned.

Why Browser-Only Matters

When you compress a PDF on most free tools, here's what actually happens:

Your file uploads to their AWS/Google Cloud bucket

Server-side code processes it

Processed file downloads back to you

Your original file sits in their storage (usually deleted after 24h... usually) For a salary slip, medical report, or legal document — this is a real privacy risk.…