Watermark PDF
Stamp text such as CONFIDENTIAL, DRAFT or your name across the pages of a PDF.
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About Watermark PDF
Mark a document as CONFIDENTIAL, DRAFT or COPY, or put your name on it before you share it. Place the text diagonally across the page or as a header or footer line, and set the colour and opacity so the content stays readable.
How to add a watermark to a PDF
- Drop a PDF into the box, or click it to choose one.
- Type the watermark text and choose placement, size, colour and opacity.
- Optionally limit it to some pages, for example 1-3.
- Click “Add Watermark”, then save the watermarked PDF.
Everything happens in your browser; nothing is uploaded. Very large files (over ~100 MB) can be slow on phones.
Frequently asked questions
Is my PDF uploaded to add a watermark?
No. TrustPDF runs entirely in your web browser using JavaScript. Your file is read and processed on your own device and is never sent to a server. The site's Content-Security-Policy does not allow the page to send anything to any other site, and you can check the open-source code on GitHub.
Can the watermark be removed?
The text is drawn onto the pages, so it cannot simply be switched off, but someone with PDF editing software could still delete it. A watermark discourages sharing; it is not a security lock.
Which characters can I use?
Latin letters with any accents (including č, š, ž, ć and đ), Greek and Cyrillic letters, digits and common punctuation. Plain Western text uses the standard PDF font; for other characters a font (Noto Sans) is loaded from this site and embedded in the PDF. Chinese, Japanese, Korean, Arabic and Hebrew are not supported yet.
