No Limits, No Uploads
Smallpdf is polished, but its free plan restricts you to a couple of tasks before asking you to upgrade, and like most online suites it uploads your documents to be processed. upmypdf takes the opposite approach: every tool runs on your own device, so there is no task counter to hit and no file to upload. Use it as many times as you like, on as many documents as you like, for free.
For confidential work this is the bigger win — your files are never transmitted, so there is nothing on a server to worry about. And your output is clean: no watermark, no 'made with' stamp, just the PDF you wanted.
How It Stays Private and Free
The whole suite is static HTML and JavaScript. When you open a tool, the code runs locally and your file is read, processed and saved on your device. The only network traffic is the one-time download of the open-source libraries — your documents are never part of it.