Watermark PDF
Add a diagonal text watermark such as CONFIDENTIAL or DRAFT across every page of a PDF.
🔒 Everything runs in your browser. Nothing you choose or type is uploaded. How to verify
How to use it
- Choose one PDF.
- Enter the text, size and opacity.
- Select Run and download watermarked.pdf.
Handy for
Marking drafts as DRAFT, labelling documents CONFIDENTIAL, or adding a company name.
Good to know
The watermark uses a standard Latin font, so letters, numbers and common symbols work but Arabic or Chinese characters do not. Lower opacity keeps the page readable.
Privacy: where the work happens
Your file is read by your browser and processed by JavaScript on this page. The result is created on your device and offered as a download. Only the page code, and any library this tool needs, is downloaded from cdnjs or jsDelivr.
Questions
Can I add a logo image?
Not yet. This tool adds text only.
Is the watermark secure?
It is drawn onto the page as a visible marker. It is not a security feature.