WebToolsHub Client-Side

PDF Watermark Tool — Add Watermarks to PDF Online

Overlay custom text watermarks across every page of your PDF file.

Interactive Tool Workspace

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Processing Limits & Device Capabilities

Processed client-side in browser memory. Recommended maximum file size is 50 MB on desktop and 15 MB on mobile.

Zero Cloud Transmission: Zero bytes are uploaded to any server. File handling is constrained only by available device RAM.

How to Use Add Watermark to PDF

  1. Upload the PDF document you want to watermark.
  2. Enter your watermark text (e.g.
  3. ,
  4. , or your company name).
  5. Configure opacity, font size, and diagonal rotation.
  6. Click
  7. and download your protected document.

About Add Watermark to PDF

The PDF Watermark tool stamps a semi-transparent text overlay across all pages of your document to prevent unauthorized redistribution and signal document sensitivity.

Frequently Asked Questions

Can the watermark be positioned diagonally?

Yes! The tool supports standard 45-degree diagonal placement that covers the page while keeping underlying text readable.

Does watermarking flatten my document?

No. The watermark is placed as an additional vector layer over the existing page tree.

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