Add Watermark to PDF Online
Stamp text or image watermarks onto your PDF pages with adjustable opacity.
Loading tool interface...
How to use Watermark PDF
- 1
Upload your PDF document.
- 2
Type your custom watermark text (e.g. 'DRAFT' or 'CONFIDENTIAL') in the input box.
- 3
Select a color preset and adjust font size, opacity, and angle using the sliders.
- 4
Click 'Apply Watermark & Download' to stamp the overlay and save your document.
Capabilities
- Custom text watermark generation in seconds
- Stamps watermarks on top of the content layer on all pages
- Adjustable sliders for font size (16px - 96px) and rotation (-90° to 90°)
- Variable opacity (5% - 90%) to keep background text readable
- Preset color themes (Red, Gray, Blue, Black)
This tool operates in a sandbox directly inside your web browser. All parsing, processing, and downloads are rendered locally. Your file size, metadata, and contents never cross the network. It works completely offline.
Frequently Asked Questions
Can the watermark be removed by other users?
The watermark is stamped directly into the PDF content stream as a text instruction. For absolute security, you can convert the watermarked PDF to JPEGs using our PDF to JPG tool.