QQudo Tools

Add Watermark to PDF

Add text or logo watermarks to your PDF. Customize the position, opacity, rotation, and page range. Your file is processed locally in your browser.

Local processing · No uploads · No imposed watermark

Drag & drop PDF here

or click to select file

Only PDF files are supported

Add Watermark to PDF Online

Qudo's PDF watermark tool lets you add text or image watermarks to your PDF documents directly in your browser. No file uploads, no software installation, complete privacy protection. Perfect for marking documents as confidential, adding company logos, or applying copyright notices.

How to Add Watermark to PDF

  1. Upload your PDF file by dragging or clicking to select
  2. Choose watermark type: text or image/logo
  3. Configure watermark settings: content, font, size, color, opacity, rotation
  4. Select position: 9 preset positions or custom coordinates
  5. Choose watermark mode: single or tiled across the page
  6. Set page range: all pages, current page, odd/even, or custom range
  7. Preview the watermark effect in real-time
  8. Click 'Add Watermark & Download' to generate and download your watermarked PDF

Text Watermark vs Image/Logo Watermark

Text watermarks are ideal for marking documents with status labels like 'CONFIDENTIAL', 'DRAFT', or 'COPY'. They support custom fonts, colors, and sizes. Image watermarks are perfect for adding company logos, signatures, or custom graphics. Both types support transparency, rotation, and flexible positioning.

Single Watermark vs Tiled Watermark

Single watermark places one watermark at your chosen position on each page. Tiled watermark repeats the watermark across the entire page in a grid pattern, ideal for security watermarks or copyright notices that need to cover the whole document.

Common Use Cases

  • Add 'DRAFT' watermark to work-in-progress documents
  • Add company logo to quotes and invoices
  • Mark internal documents with 'CONFIDENTIAL' watermark
  • Add copyright notices to educational materials
  • Apply 'NOT FOR RESALE' watermark to sample products
  • Add approval stamps to contract documents

Page Range Format Guide

Use numbers separated by commas for individual pages, and hyphens for ranges. Examples: '1' for page 1 only; '1,3,5' for pages 1, 3, and 5; '1-5' for pages 1 through 5; '1,3-5,8' for pages 1, 3, 4, 5, and 8. The tool automatically deduplicates and sorts page numbers.

Privacy & Security

All processing is done locally in your browser. Qudo does not upload, view, or store your PDF or watermark content.

Limitations

PDF watermarks can improve content identification but cannot guarantee that watermarks are impossible to remove with professional software. This tool does not bypass password protection on encrypted PDFs. Very large PDFs (hundreds of pages with high-resolution images) may require significant memory.

Frequently Asked Questions

Is my PDF uploaded to a server?▼
No. All processing happens locally in your browser. Your PDF never leaves your device.
Can I add Chinese, Japanese, or Korean text watermarks?▼
Yes. The tool automatically loads appropriate fonts for CJK characters when needed.
Will the watermark affect the original PDF quality?▼
No. The watermark is added as a vector overlay. Original text, images, and vector content remain unchanged and clear.
Can I remove the watermark later?▼
The watermark is embedded in the PDF. You can use the undo feature before downloading, but once downloaded, you would need PDF editing software to remove it.
Why does the watermark appear garbled for some languages?▼
This usually happens when the required font is not loaded. The tool supports automatic font loading for CJK and other scripts. Make sure you have a stable internet connection for the first load.
Can I add different watermarks to different pages?▼
The current version applies the same watermark to all selected pages. For different watermarks, you can process the PDF multiple times with different page ranges.
Does it work on mobile?▼
Yes. The tool is fully responsive and works on mobile browsers.
What image formats are supported for logo watermarks?▼
PNG (with transparency), JPG/JPEG, and WebP are supported. PNG is recommended for logos with transparent backgrounds.

All processing is done locally in your browser. Qudo does not upload, view, or store your PDF or watermark content.