Watermark PDF
Add a semi-transparent text watermark across every page.
Watermark PDF stamps text across every page — diagonal or tiled, at the size and opacity you choose — as part of the page content. Useful for "DRAFT" or "CONFIDENTIAL" before sharing; runs in your browser.
Watermark PDF stamps text such as CONFIDENTIAL or DRAFT across every page, with a live preview before you apply it. You control the layout, size, color, and opacity. Watermark PDF is one of UnboundPDF's 53 free browser-based PDF and image tools: it runs on your own device with no upload, no account and no watermark, and reports what it measured on the output.
How to watermark PDF — steps & common uses
What people use Watermark PDF for
People marking documents before sharing — stamping DRAFT, CONFIDENTIAL, or a name across every page.
- Stamp DRAFT across a document
- Mark pages CONFIDENTIAL
- Add a company or owner name
- Label a copy before sending
- Deter reuse of a shared file
How to watermark PDF
- Add your PDF; it is processed on your device with nothing uploaded.
- Type the watermark text and choose a diagonal, horizontal, or tiled layout.
- Adjust the size, color, and opacity while checking the live preview on page one.
- Click Apply watermark, then preview and download the watermarked PDF.
Questions about Watermark PDF 6
Are my files uploaded to a server?
No. UnboundPDF processes PDFs locally in the browser — documents are not uploaded to a server. We have no backend that receives, stores, or scans your files.
Will the watermark appear on every page?
Yes. The same text watermark is stamped onto all pages using the layout and opacity you chose.
Can I make the watermark subtle?
Yes. Lower the opacity for a faint background mark or raise it for a bold overlay, and pick gray, red, or blue.
Can I put the watermark on every page?
Yes. The text is stamped across all pages in one pass.
Is the watermark part of the page or removable?
It is drawn into the page content, so it travels with the file wherever it is opened or printed.
Will it obscure my text?
Placed in the centre it overlays content by design; check the preview and adjust the placement if it covers something important.
Read more
How your files are handled
The work runs on your own device, inside the browser tab — so there is no server to send your document to.
- Nothing is uploaded. We have no backend that receives or stores documents, so we cannot see your files during processing or after.
- Your device does the work. Large documents are handled in stages, pages are rendered as you reach them, and each job is checked against your device before it starts — so a long run takes longer on a phone than on a laptop, nothing is queued behind other people's jobs, and you can stop a run at any point without touching your original file.
- No account and no watermark. The output is a clean file you can use anywhere, with no sign-up and no hourly cap.
More edit tools
Other free PDF utilities that work the same way — in your browser, no sign-up.