PDF Watermark
Add a text watermark to all pages of a PDF. Customize position, size, opacity and color. 100% in browser.
Drag your PDF here or click to select it
Upload a PDF and configure the text, position, size, opacity and color of the watermark.
Built by
Miguel Ángel Colorado Marin
Built by
Miguel Ángel Colorado Marin
Full-Stack Developer · Guadalajara, España
I develop web apps, digital tools and full projects — from design to deployment.
How to add a watermark to a PDF?
- 1
Upload the PDF
Drag your PDF file to the upload area or click to select it from your device. The file name and total number of pages it contains are shown.
- 2
Configure the watermark
Write the watermark text (for example: CONFIDENTIAL, DRAFT, COPY). Choose the position (diagonal for the most visible, center for discrete, top or bottom for marginal), font size, opacity and color. A real-time preview shows how it will look.
- 3
Apply and download
Click Add watermark. The tool embeds the text on all PDF pages and automatically downloads the result with the _watermarked suffix. Everything happens in your browser without sending anything to any server.
Frequently asked questions
How many pages does the watermark get added to?
The watermark is automatically applied to all PDF pages without exception. In this version it is not possible to select specific pages to exclude. If you only want to mark some pages, you can first split the PDF with the PDF Split tool, mark the desired pages and then merge again with PDF Merge.
Can I customize the appearance of the watermark?
Yes, you have full control. You can change the watermark text (up to 80 characters), position (classic diagonal, centered, at the top or bottom of the page), font size from 12pt to 120pt, opacity from 5% to 100%, and color with a full color picker. A real-time preview in the tool shows how it will look before applying.
Can the watermark be removed afterwards?
The watermark is embedded directly in the vector content of the PDF pages. It does not exist as a separate layer or annotation that can be easily removed. Watermarks that need to be removable later require specialized PDF editing tools.
Does it work with scanned PDFs or images?
Yes. The watermark is added as vector text over the content of each page, regardless of whether that page contains native text, scanned images or other elements. It works with any type of PDF.
Are my PDFs sent to any server for processing?
No, absolutely not. All processing happens exclusively in your browser using the open source pdf-lib library. No PDF file leaves your device at any point. It is completely private and suitable for sensitive or confidential documents.
Related tools
Embed the tool on your site
Embed this PDF watermark tool in any web page with a simple iframe:
<iframe
src="https://miguelacm.es/embed/pdf-watermark"
width="100%"
height="600"
frameborder="0"
title="PDF Watermark"
></iframe>