Is it safe to upload documents to online converters?
“Convert Word to PDF for free” is handy: drop the file in, download the result. But to convert it, the service gets a full copy of the document. Here is what that means and when you can skip the upload.
What happens to the file
An online converter almost always works on a server: the file is uploaded, processed, and you download the result. Many services promise to delete it after an hour or a day, but you cannot check that. Copies can remain in backups and logs, and the file itself passes through the service’s hosting and other contractors.
What the risks are
- Passport scans, contracts, certificates and statements are personal data. If the service is breached, they end up with strangers.
- Free services make money from ads and analytics, and their data retention rules can be very broad.
- Work documents: uploading them to a third-party service may break your company’s rules or a non-disclosure agreement.
How to check a service
- Read the privacy policy: how long the file is kept, which country the servers are in, whether it is shared with third parties.
- Open the Network tab in your browser and see whether the file goes to a server — step-by-step guide.
- Turn off the internet after the page loads: a service that needs a server will stop working.
How to do without uploading
The most common conversion is to PDF, and it needs no server. Word, LibreOffice and Google Docs have Save as PDF or Export to PDF. Any program can print to PDF: on Windows, the “Microsoft Print to PDF” printer; on a Mac, the PDF button in the print dialog; on Android, “Save as PDF” when printing.
And if you just need to read the file — say, someone sent a DOCX and you have no Word — there is no need to convert it at all. OsonKit opens documents, spreadsheets, presentations and PDFs right in your browser, and the file never leaves your device. It is a viewer: it shows files but does not convert them.