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What happens to your files on converter sites

Type "convert PDF to Word" into a search engine and you get a hundred sites that look identical. Almost all of them work the same way: your file is uploaded to a server, converted there, and stored for some period nobody tells you about. For a holiday photo that is fine. For a signed contract, a passport scan or a payslip, it is a decision worth making consciously.

How to tell whether a site uploads your file

You do not need to trust the marketing copy. Open the browser's developer tools (F12), go to Network, and convert something small:

  • If you see a POST request carrying megabytes of data, your file went to their server.
  • If the network stays quiet after the page loads, the work happened on your machine.

The second kind became possible only recently, thanks to WebAssembly — the same FFmpeg, the same PDF libraries a desktop program uses, compiled to run inside a browser tab.

Why it matters more than it sounds

  • Retention is rarely specified. "Files are deleted after a few hours" is a promise, not a mechanism, and it says nothing about backups.
  • The upload itself is logged with your IP address, on servers whose jurisdiction you did not choose.
  • Some services train on, or index, what they receive. Free is not free; you are usually paying with data.
  • Corporate policy often forbids it outright, and "I used a free website" is a difficult sentence to say to a security officer.

What to use instead

Everything on this site runs in your browser unless the page explicitly says otherwise. Compressing a PDF, converting it to Word, signing it — the file is read by your own machine and never transmitted.

Compress PDF onlineReduce PDF file size in your browser. Best for scanned and image-heavy PDFs. Files never leave your device.
Convert PDF to Word onlineConvert PDF to an editable Word document in your browser. Headings and paragraphs kept, nothing uploaded. Premium converts full layouts on our servers.
Sign a PDF onlineSign a PDF in your browser: draw your signature or upload a photo of it, place it on any page and download. The file never leaves your device.

Two of our tools are honest exceptions — Excel and PowerPoint conversion, because no browser engine can lay out an Office document. Those pages say so in plain text, the file is deleted as soon as the result is ready, and nothing is kept.

The practical rule: if a tool does not tell you where your file goes, assume it leaves your device, and decide whether this particular file can afford that.

Published 2026-09-23