Watermarking PDF documents protects your intellectual property, marks documents as drafts or confidential, and prevents unauthorised redistribution. Here is how to add watermarks to PDF files online for free.
Why Watermark PDFs?
- Mark confidential documents to prevent unauthorised sharing
- Add "DRAFT" or "FOR REVIEW ONLY" stamps during document review processes
- Protect your original work with a copyright notice
- Add a company branding watermark to official documents
- Prevent PDF content from being passed off as someone else's work
How to Add Watermark to PDF Free
Visit imgresizr.com's PDF Tools section and upload your PDF. Choose between a text watermark (e.g., "CONFIDENTIAL", "DRAFT", or your copyright text) or an image watermark (your logo). Set the watermark position (centre, diagonal, corner), opacity (30–50% for subtle watermarks), and apply to all pages or specific pages. Download the watermarked PDF.
Watermark Types and Settings
| Type | Best Use | Opacity |
|---|---|---|
| Diagonal text | Confidential/Draft marks | 20–40% |
| Corner logo | Branding and ownership | 60–80% |
| Full-page text | Strong protection | 10–20% |
Watermark Design Tips
- Use 20–30% opacity for a professional look that does not obscure content
- Diagonal placement is harder to remove than horizontal or vertical
- Large text spanning the full page provides stronger deterrence than small corner marks
- Include your website or email in the watermark for easy contact if the document is shared
Add watermarks to PDF files for free at imgresizr.com — text or logo watermarks, any opacity, applied to any pages.