Add Watermark
Add a gray watermark tilted 45 degrees to the center of every page.
What this tool is for
Add a visible text watermark to drafts, internal review copies, or shared PDF documents.
How to use it
- Select one PDF file.
- Enter the watermark text, font size, and opacity.
- Click “Add Watermark”.
- Save watermark.pdf and check every page.
Local file processing
The watermark is added in your browser. Your PDF and watermark text are not sent to a server.
Limitations
- This tool does not edit or remove existing PDF text.
- Encrypted, damaged, or very large PDFs may fail.
- Always review important documents before use.
FAQ
Can I use non-English watermark text?
Yes, the watermark is drawn by the browser, so many languages are supported.
What opacity values are allowed?
Use a value between 0 and 1. The default is 0.3.
Is the original PDF modified?
No. The tool creates a new watermarked PDF.