Optimise PDF
Add a watermark to a PDF
Place clear diagonal text across every page.
Choose your file
Choose one PDF and enter short watermark text.
The watermark is added locally in your browser. The selected PDF is not uploaded.
How to use it
Three clear steps
- 1
Choose a PDF.
- 2
Enter text such as DRAFT or CONFIDENTIAL.
- 3
Select Add watermark and download the new PDF.
Options and output
What this tool does
- The watermark is centred diagonally on every page.
- Use short text for the clearest result.
File privacy
Processed on your device
The watermark is added locally in your browser. The selected PDF is not uploaded.
Troubleshooting
If the file will not process
- Some characters outside the standard PDF font set are simplified.
- A watermark is a visible label, not access control or encryption.
Useful answers
Common questions
Can a watermark stop copying?
No. It communicates status or ownership but does not secure the PDF.
Does the watermark cover my original?
It is drawn with low opacity on a new copy; your source file stays unchanged.