ShadowToolkit

Pdf Watermark

Pdf Watermark running client-side on your device.

100% In-Browser
All-In-One PDF StudioMulti-Doc + Live Preview

Want to merge, watermark, compress, protect, delete pages & preview results side-by-side with ZIP exports?

Try PDF Playground
100% In-Browser PrivacyLocal

Your files and data are processed locally and never leave your device.

Select PDF to add custom watermark

All processing runs 100% locally inside your web browser. Zero server uploads.

Max size: 300MB •100% In-Browser

What is Pdf Watermark?

Add Watermark to PDF applies customizable text stamps and copyright watermarks across all pages of your PDF document. Mark files as 'CONFIDENTIAL', 'DRAFT', 'SAMPLE', or stamp your company name with complete control over angle, opacity, color, and font size.

Zero-Server Client-Side Guarantee

Unlike legacy online utilities that upload sensitive media and documents to remote cloud storage, Shadow Toolkit executes this entire operation directly within your browser's local runtime. Your raw data never crosses the network.

Key Capabilities

  • Applies text watermarks across all pages or custom page ranges
  • Popular preset stamps: 'CONFIDENTIAL', 'DRAFT', 'COPY', 'APPROVED', 'FINAL'
  • Configurable opacity, font size, rotation angle (diagonal/horizontal), and text color
  • Precise foreground/background layer placement behind or in front of text
  • 100% private client-side rendering with zero server uploads

Common Use Cases

1Stamping legal briefs, discovery documents, and contracts with 'CONFIDENTIAL' notices
2Marking architectural and creative drafts with 'DRAFT - NOT FOR CONSTRUCTION' warnings
3Adding company copyright branding to downloadable whitepapers and reports
4Organizing and preparing official business documents, academic papers, and tax forms for electronic filing

How to use Pdf Watermark

01

Upload PDF Document

Select the PDF file you want to watermark.

02

Customize Watermark

Type your text stamp, set diagonal angle, adjust opacity and color.

03

Download Watermarked PDF

Click 'Apply Watermark' to download your branded document.

04

Compile & Save Document

Click the action button to let pdf-lib compile your new PDF in local memory, then download the finished document immediately.

Frequently Asked Questions

Yes. You can choose whether the watermark is drawn as an overlay on top of content or as an underlay behind text.

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