How to use Watermark PDF
Choose the PDF, type the watermark text and pick an opacity. Press Process PDF and download the watermarked file.
Choosing the opacity
Light (15%) keeps the page easy to read and suits drafts. Medium (30%) shows clearly on printed copies. Strong (50%) is hard to miss but can make small text harder to read.
What a watermark does and does not do
A watermark marks a copy as a draft or as private, and shows who a document came from. It is not security: anyone with a PDF editor can remove it. For real protection, share the file only with the people who need it.
How it works
Grey diagonal text is drawn across the centre of each page
Examples
- Worked example
Stamp CONFIDENTIAL across every page at 30% opacity.
Limitations and assumptions
Latin letters, numbers and common punctuation only; other scripts are not supported by the built-in font. The watermark is visible text, not protection: it can be removed with PDF editing software.
Frequently asked questions
Can I use my logo as a watermark?
Use Add Image to PDF: choose your logo, the Center position and 40% opacity for a watermark look on every page.
Which characters can I use?
Latin letters, numbers and common punctuation. Other scripts are not supported by the built-in font.
Is my PDF uploaded?
No. The watermark is drawn inside your browser and the file stays on your device.