Watermark PDF
Stamp your PDF pages with customizable text watermarks like CONFIDENTIAL, DRAFT, or custom copyright text with control over opacity, rotation, and position.
Upload PDF to Watermark
Up to 50MB
Processed entirely in your browser. 100% private.
Key Takeaways & Quick Facts
Add custom text watermarks to your PDF documents.
100% Client-Side In-Browser (Zero Cloud Uploads)
Calculations tested against standard benchmarks
How to Use Watermark PDF
- Upload your PDF document.
- Type your desired watermark text (e.g. CONFIDENTIAL, DRAFT, SAMPLE).
- Customize font size, opacity (0.1 to 1.0), rotation angle, and position (center, top, bottom).
- Optionally choose specific pages to watermark.
- Click "Add Watermark" and download your branded PDF.
How it Works
The Watermark PDF tool embeds standard Helvetica Bold typography directly onto the content stream of each page at the calculated rotation and opacity coordinates.
Examples
Input: Preliminary proposal draft
Result: Proposal stamped with semi-transparent "DRAFT" diagonal across the center
Frequently Asked Questions
Can the watermark be easily removed?
The watermark is rendered into the vector graphics stream of the PDF. While not impossible for dedicated vector editors, it cannot be removed with standard PDF viewers.
Can I make the watermark subtle?
Yes! You can adjust the opacity slider down to 0.15 - 0.3 for a faint, professional watermark that doesn't obstruct underlying text.
Calculations are verified against standard mathematical and banking benchmarks. Data stays on your device in local memory.
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