Which PDF Tools Upload Your Files? How to Check

What each service says about its online tools, from its own pages (checked October 2026). Policies change, so check the current wording before you rely on it:

• iLovePDF: files are processed on its servers and kept for a maximum of 2 hours so you can download the result, then removed.
• Smallpdf: describes its online tools as cloud-based; files are encrypted in transit and automatically deleted after one hour.
• PDF24 Tools: the online tools process files on PDF24 servers and remove them after a short time. PDF24 also offers a free desktop app, PDF24 Creator, that works offline.
• Sejda: files are automatically deleted after 2 hours. The free web version is limited to 50 pages or 50 MB and 3 tasks per hour. Sejda Desktop processes files on your own computer.
• Drible: 48 of 53 tools run entirely in your browser and never upload anything. Five conversions upload the file because they need desktop software on the server, and that file is deleted as soon as the result is sent back.

Merging, splitting, rotating, signing, editing, watermarking, password protecting, unlocking, adding page numbers and turning PDFs into images all happen in your browser. Merge PDF, Split PDF, Sign PDF and Edit PDF never send the document anywhere, and the same is true for every image, text, developer and converter tool.

The five exceptions are PDF to Word, Word to PDF, PDF to Excel, PDF to PowerPoint and Compress PDF. They need LibreOffice, Ghostscript or a table extractor, which only run on a server. Each of those pages says so before you upload, the file travels over HTTPS, and it is deleted right after the converted file is returned, with a safety sweep every 30 minutes for anything left behind. How it works explains the whole path, and the Privacy Policy has the formal version.

You do not have to take any site at its word, including this one. Two simple tests show whether your file is being uploaded:

1. 1

   Watch the network

   On a computer, open the site, press F12 to open the developer tools and switch to the Network tab. Now add your file and run the tool. A tool that uploads shows a large request roughly the size of your file going to the server. A tool that works locally shows no such request.

2. 2

   Try it offline

   Open the tool, run it once on a test file so everything it needs is loaded, then switch off Wi-Fi and run it again on another file. If it still works, the processing happens on your device. If it fails or waits forever, it needs a server.

3. 3

   Read the small print

   Look for phrases like processed on our servers, deleted after one hour or cloud-based. Those mean an upload. Phrases like runs in your browser or files never leave your device mean local processing, which the two tests above can confirm.

For a restaurant menu or a public brochure, an upload makes no difference, and a server tool is often faster on an old phone. The calculation changes for documents with personal or confidential information: identity documents, signed contracts, payslips, tax forms, medical letters and anything covered by a confidentiality agreement or by your employer rules. For those, prefer a tool that works in the browser, or a desktop program such as PDF24 Creator, Sejda Desktop or PDFsam.

If you need one of the conversions that only a server can do, remove what you can first. Split PDF can cut the file down to the pages you actually need converted, and the Word conversion guide explains how to get the cleanest result in one pass.