Konvizi
Free No upload
Stamp every page of your PDF with diagonal text such as “Copy” or “Confidential”, without uploading anything.
Drop your PDF files here
or
Your files stay on your device
Konvizi’s “Watermark PDF” tool is free, with no sign-up, no watermark and no file limit. All the processing happens in your browser, on your device: your files are never uploaded to a server, which makes it suitable for personal and confidential documents.
Drag your PDF files into the area above or click “Choose files”. You can add several at once.
For example “Copy”, “Confidential” or “For rental application only”. Click “Add watermark”.
The text runs diagonally across every page, in transparent grey.
When you send an ID card, proof of address or a payslip to rent a flat, a watermark like “Copy for agency X – rental application only” makes fraudulent reuse much harder. It also marks a draft or a confidential document. The text is written in transparent grey, so the document stays readable.
PDF is the universal document format: it looks the same on every device, keeps its layout and prints without surprises.
Contracts, payslips, bank statements, tax returns: PDFs often hold sensitive information. With Konvizi they never leave your device, are stored nowhere and read by nobody. Most PDF tools copy pages without recompressing them: selectable text, links and quality are preserved.
Your files never leave your device. No upload, no storage.
No upload and no queue: the conversion starts right away.
As many files as you like, with no imposed size limit.
No sign-up, no watermark, no subscription.
| Konvizi | Typical online converter | |
|---|---|---|
| Where your files are processed | In your browser, on your device | On the service’s servers |
| Upload to the internet | None | Required, then you download the result |
| Storage of your files | None: nothing is stored | Stored on a server, at least while processing |
| Waiting time | Starts instantly | Upload time, sometimes a queue |
| Account | Never required | Often required beyond a few files |
| Watermark and limits | No watermark, no maximum number | Common on free plans |
Yes, completely. No sign-up, no watermark, no limit on the number of files.
No. Everything happens in your browser, on your device. Your files are never sent over the internet: nobody but you can see them.
Not easily: it is written into the pages like the rest of the content, which is the whole point. Keep the original PDF if you still need a version without the watermark.
Yes. The text is placed on top of whatever each page contains: text, a scan or a photo. Its size adapts to the page, in portrait or landscape. Accented letters and Devanagari are supported.
Open your browser’s developer tools (F12 key), go to the “Network” tab and run a conversion: no request carries your file. The site also enforces a security rule (Content-Security-Policy) that forbids the browser from contacting any site other than konvizi.com, and konvizi.com is a static site with no service able to receive files.
Yes. Konvizi works in the browser of your phone or tablet (Safari, Chrome…) just like on a computer, with no app to install. Very large files are processed faster on a computer, which has more memory.