Watermark PDF
Add text or image watermarks to your PDF. Your files stay private and never leave your browser.
All processing happens in your browser. No uploads, no tracking.
About PDF Watermarking
Everything you need to know about adding watermarks to a PDF
Load a PDF file, choose between text or image watermark, configure position and opacity, then save your watermarked PDF. All processing happens in your browser.
Step-by-step process:
- Click the drop zone or drag a PDF file
- Choose between text or image watermark
- Configure position, opacity, and pages to apply
- Save your PDF with the watermark applied
Technical specifications:
- • Engine: pdf-lib with built-in Helvetica font
- • Lossless: original content remains intact
- • Processing: 100% in-browser, files never uploaded to servers
- • Supports text and images (PNG, JPG) as watermarks
- • Configurable opacity: 25%, 50%, or 75%
Adding watermarks in the browser offers unique advantages over desktop software and online services. Your files stay on your device, processing is instant, and there are no fees or limits.
Watermarking methods compared:
| Browser (PDFSuite) | Desktop Software | Online Services | |
|---|---|---|---|
| Privacy | Local files | Local files | Requires file upload |
| Cost | Free, unlimited | License $50-200 | Free with limits |
| Output quality | Lossless quality | Lossless | Often compressed |
| Size limit | No limit | No limit | 10-50 MB typical |
| Speed | Instant (no upload) | Fast (local) | Depends on connection |
Key advantages:
- • 100% Private: Your PDFs never leave your computer
- • No Installation: Works directly in your browser
- • Lossless: Original content remains intact
- • No Registration: Start using immediately
- • Works Offline: Process files without internet (after initial load)
PDFSuite offers two watermark types to suit different needs:
Text watermark
- • Customizable text: CONFIDENTIAL, DRAFT, your name, etc.
- • Three positions: center, diagonal, or tile
- • Adjustable opacity: 25%, 50%, or 75%
✓ Best for: Confidential documents, drafts, review copies
Image watermark
- • Load your logo or image in PNG or JPG format
- • Original image proportions are maintained
- • Supports transparent PNG for professional results
✓ Best for: Corporate branding, logos, visual signatures
Does watermarking affect PDF quality?
No. PDFSuite uses pdf-lib to add the watermark as a layer on each page without re-rendering the content. Original text remains selectable, images maintain their quality, and file size barely changes.
Can I apply the watermark to specific pages only?
Yes. You can choose between applying to all pages or specifying a range (e.g., 1-3, 5, 7-10). This is useful if you only need to mark certain sections of the document.
What image formats can I use?
You can use PNG or JPG images. PNG images with transparency work especially well as watermarks, as they allow the underlying content to show through.
Are my files secure?
Yes. All processing happens locally in your browser using JavaScript. Your files are never uploaded to any server. Once you close the page, all data is cleared from memory.
Can I watermark password-protected PDFs?
Not directly. Password-protected PDFs need to be unlocked first. If you have access to the original unprotected PDF, you can add the watermark directly.
What is tile mode?
Tile mode repeats the watermark in a grid pattern across the entire page. It's the most professional and hardest-to-remove style, ideal for confidential documents that need complete visual protection.