Free 100% In-Browser Tool

PDF Watermark: Add Confidential & Draft Stamps to PDF

Add custom text or logo watermarks to PDF pages with opacity controls.

Quick Answer:Upload your PDF, enter your watermark text (or select 'CONFIDENTIAL' / 'DRAFT'), adjust transparency, and download your watermarked PDF immediately.

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Privacy First: 100% Client-Side Processing

Processed in your browser. Files are never uploaded.

How to Use the PDF Watermark: Add Confidential & Draft Stamps to PDF

1Upload your PDF document.
2Type your watermark text (e.g. 'CONFIDENTIAL', 'DRAFT', or your company name).
3Adjust font size, opacity (20% recommended), rotation angle (-45°), and color.
4Download your securely watermarked PDF file.

Formula & How It Works

Vector PDF Watermark Overlay

ctx.save(); ctx.translate(cx, cy); ctx.rotate(angle); ctx.globalAlpha = opacity; ctx.fillText(text); ctx.restore()

Overlays a rotated semi-transparent text vector layer onto each page's visual tree.

Worked Examples

Confidential Contract

Input: contract.pdf with 'CONFIDENTIAL' stamp

Explanation: Protects trade secrets during business negotiations.

Result: Watermarked PDF with -45° red overlay

Review Draft

Input: novel_chapter.pdf with 'DRAFT COPY'

Explanation: Prevents unauthorized early publication.

Result: Watermarked PDF with light gray stamp

Sample Work Portfolio

Input: portfolio.pdf with 'SAMPLE' watermark

Explanation: Protects intellectual property when quoting freelance clients.

Result: Watermarked design sheets

Frequently Asked Questions

How do you add a watermark to a PDF?▼

Upload your PDF into our tool, type your watermark text, adjust rotation and opacity, and click 'Download Watermarked PDF'.

Will the watermark cover up my text?▼

Our tool applies semi-transparent overlays (typically 15% to 25% opacity) so the underlying document text remains completely legible.

Can someone easily delete the watermark?▼

The watermark is embedded directly into the document's vector visual stream, making casual removal difficult without specialized editing software.

Does it watermark every page in the document?▼

Yes, our tool automatically applies the watermark across every single page in your PDF document.

Are my confidential files uploaded to a server?▼

No! All watermarking runs locally on your computer inside your web browser. Your private documents are never uploaded.

Is this tool free?▼

Yes, Toolzy PDF tools are 100% free with no watermarks of our own added.

Quick Reference & Conversion Table

Watermark Stamp	Suggested Color	Optimal Opacity	Standard Angle
CONFIDENTIAL	Crimson Red / Bold Gray	15% – 25%	-45° diagonal
DRAFT	Slate Gray	20% – 30%	-45° diagonal
SAMPLE	Amber / Orange	20% – 25%	-45° diagonal
COPYRIGHT NOTICE	Dark Blue / Black	10% – 15%	Bottom footer horizontal

⚠️ Common Pitfalls to Avoid

•Setting opacity too high (over 50%), obscuring underlying document text and making it difficult to read.
•Placing watermarks only on page 1 instead of stamping all pages across the document.

💡 Practical Real-World Uses

•Protecting business proposals and investor pitch decks from unauthorized sharing.
•Stamping legal contracts with 'DRAFT - NOT FOR EXECUTION' during drafting.
•Marking academic exam papers and student sample assignments.

Last reviewed & updated: 2026-11-10

Free & Open Access

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