Watermark PDF
Last updated: June 1, 2026In-browserAdd a text watermark to every PDF page.
Watermark PDF is a free online tool to add a text watermark to every PDF page. It runs entirely in your browser, so your files never leave your device — nothing is uploaded. There's no sign-up, no watermark, and it works on any modern browser on desktop or mobile.
How to use Watermark PDF
Watermark PDF stamps text like CONFIDENTIAL or DRAFT diagonally across every page of a PDF, with adjustable size and opacity. It's the quick way to mark documents before sharing. It's processed privately in your browser — nothing is uploaded and we add no watermark of our own.
Read the full guide: How to Add a Watermark to a PDF (Free)
- 1Drop in your PDF.
- 2Type your watermark text and set the size and opacity.
- 3Apply it to every page and download the watermarked PDF.
Mark every page
Apply CONFIDENTIAL, DRAFT or your own text diagonally across the whole document.
Size and opacity
Make the stamp bold or subtle to suit the document.
Private and free
Only your text is added, on your device — no upload and no sign-up.
Watermark PDF — frequently asked questions
How do I add a watermark to every PDF page?
Type your text, set the size and opacity, then apply — the stamp is added to every page and you download the result.
Can I make the watermark faint?
Yes — lower the opacity for a subtle stamp or raise it for a bold one.
Does this add its own watermark?
No. The only mark on the PDF is the text you choose.
Is it free?
Yes, free with no account.
Is my PDF uploaded?
No, watermarking runs entirely in your browser.
Share this tool
Send it to someone who needs it or save the link for later.