PDF Watermark Tool
Add text watermarks to PDF files to protect copyright and indicate document status. Customize text, position, opacity, and rotation. Download watermarked PDFs instantly.
- PDFs never leave your device
- No server upload required
- Works completely offline
- No login or signup needed
How It Works
Upload a PDF file and enter your watermark text (e.g., CONFIDENTIAL, DRAFT, your company name). Customize the watermark appearance: font size, color, opacity, rotation angle, and position on each page. The tool uses pdf-lib JavaScript library to modify the PDF client-side. Preview shows how the watermark will appear. Download the watermarked PDF ready to share. All PDF processing happens in your browser — your documents are never uploaded to any server.
Frequently Asked Questions
Can I add watermarks to all pages?
Yes! The watermark is automatically applied to all pages in the PDF document.
Can I rotate the watermark?
Yes! Adjust the rotation angle from 0° to 360°. Diagonal watermarks (45°) are popular for copyright protection.
Does this change the PDF quality?
No! The tool adds the watermark without re-rendering the PDF, maintaining original quality.
What PDF versions are supported?
The tool works with most standard PDF files (PDF 1.3 and newer).
Can I use this for confidential documents?
Absolutely safe! All PDF processing happens in your browser. No files are uploaded to any server.