Add Watermark to PDF — Stamp Every Page
A watermark marks a document as confidential, draft, or copyright-protected, discouraging casual redistribution and making the status obvious on every printed page. The stamp is applied diagonally across all pages at partial opacity so the underlying content stays readable.
How to apply watermark in your browser
- 1Add the PDF you want to watermark.
- 2Click Apply Watermark to stamp every page.
- 3Download the watermarked document.
Frequently Asked Questions
Will the watermark hide my content?
No. It is drawn at reduced opacity across the diagonal, so it is clearly visible as a status marker while the text underneath stays fully readable.
Can the watermark be removed by someone else?
It is drawn into the page content rather than added as a removable annotation layer, so it cannot simply be deleted in a PDF reader. Determined removal is always possible with enough effort — treat a watermark as a deterrent, not as security. For genuine protection use Encrypt PDF.
Are my files uploaded to a server?
No. This tool runs entirely inside your browser using WebAssembly — your file is never uploaded, never stored on a server, and never seen by us. You can confirm it by opening your browser's Network tab while the tool runs, or by disconnecting from the internet after the page loads: it still works.