Add Watermark to PDF

Protect your documents with custom text or image watermarks. All processing happens locally in your browser.

Select PDF File

or drop file here

Supports single PDF • 100% Local process in your device

How to Add Watermark to PDF

Protect your intellectual property in three simple steps. Our real-time preview lets you see exactly how the final result will look.

1

Upload your PDF

Click the Select PDF File button or drag and drop your document. Your file stays on your device—nothing is uploaded to any server.

2

Customize & Preview

Choose Text or Image watermark. For text, customize the content, font (4 options), font size (12pt to 72pt), color, rotation angle (-90° to 90°), opacity (10% to 100%), and density (low, medium, high). For images, upload your logo and adjust scale, rotation, opacity, and density. Watch changes appear instantly on the page previews.

3

Apply & Download

Once satisfied, click Apply & Download PDF. Your watermarked PDF will be generated instantly. The watermark is permanently embedded and cannot be easily removed.

Why Choose CedarPDF for Watermarking?

100% Private & Secure

CedarPDF processes everything locally in your browser. Your documents never leave your device, ensuring complete confidentiality. In the age of AI, this is especially important: your files never become training data for AI systems.

Real-Time Visual Preview

Don't guess how your watermark will look. Our tool renders a live preview on every page as you adjust settings. You can see the exact position, opacity, rotation, and density before you even click "Apply".

Free & Unlimited

All features are completely free with no limits. Process unlimited PDF files regardless of size or page count. No sign-up required, no watermarks on output, and no hidden fees. Forever.

Text or Image Support

Need a simple text stamp? Or a company logo watermark? Switch between modes instantly without reloading the page. Control every aspect including opacity, rotation, font size, color, scale, and density.

When Do You Need to Add Watermarks?

From students to professionals, CedarPDF helps people protect their documents effortlessly.

For Students & Researchers

Protect Academic Work

  • Add "DRAFT" watermarks to thesis drafts before sharing with advisors.
  • Watermark original research to protect intellectual property.
  • Best of all: Completely free for unlimited student use!
For Professionals & Business

Secure & Professional Documents

  • Add "CONFIDENTIAL" watermarks to sensitive contracts or financial reports.
  • Watermark internal documents before distributing to external partners.
  • Best of all: Your confidential documents never leave your computer.
For Daily Life & Others

Protect Creative Works

  • Photographers: Add copyright watermarks to photo portfolios.
  • Artists: Protect digital artwork from being stolen.
  • Best of all: Works perfectly on mobile phones and tablets.

Frequently Asked Questions

Can I use my own logo as a watermark?
Yes! Select the "Image Watermark" tab and upload your PNG or JPG logo. You can then adjust its scale, rotation, opacity, and density just like a text watermark.
Can I adjust the transparency of the watermark?
Yes! Use the "Opacity" slider to make it faint (for background use) or solid. The preview updates instantly as you adjust the slider.
Is my document safe? Do you store my files?
Your data is 100% safe. CedarPDF runs entirely in your web browser. Your PDF files never leave your device and are never uploaded to our servers. In the age of AI, this is especially important: unlike other tools that may use your documents to train AI models, CedarPDF processes everything locally. Your files never touch remote servers, never get stored, and never become training data for AI systems. You maintain complete control and privacy.
Is the watermark permanently embedded?
Yes. Once you click "Apply," the watermark is flattened directly into the PDF content and cannot be easily removed by standard PDF readers. This ensures your watermark stays intact when the PDF is shared or printed.
Is there a limit to how many files I can process?
No limits at all. CedarPDF is completely free to use. You can add watermarks to unlimited PDF files, regardless of their size or page count, without needing to register or pay. There are no daily usage caps and no "premium" tiers.
Can I customize the font, size, and color for text watermarks?
Yes! You can choose from 4 fonts (Helvetica, Times Roman, Courier, and Courier Bold), adjust the font size from 12pt to 72pt using a slider, and pick any color using the color picker. This lets you perfectly match your document's style and ensure the watermark is clearly visible.
Does it work on mobile devices?
Yes! CedarPDF is designed to work on all types of devices. Whether you are on a PC, Laptop, Tablet, or Mobile phone (iOS or Android), our interface adapts to your screen size. Since everything runs in your browser, you don't need to install any apps. Just open the website and start working.