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Watermark PDF

Add text watermarks to your PDF documents — entirely in your browser.

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About Watermark PDF

Add customizable text watermarks to every page of your PDF document.

  • Diagonal — classic rotated watermark across the page
  • Center — centered text overlay
  • Top/Bottom — header or footer style watermark

All processing happens locally in your browser using pdf-lib. No files are uploaded to any server.

Technical Specification

PDF Watermark Application & Overlay Rendering Engine

Overview

The ToolsForges Watermark PDF tool overlays text-based watermarks onto PDF pages for document protection, draft marking, and confidentiality labeling — all executed entirely within the browser. Upload a PDF, configure the watermark text, adjust font size, opacity, position, and rotation angle, then download the watermarked document.

Feature Specifications

  • Configurable Text WatermarksCustomize watermark text content, font size, color, and opacity to create visible or subtle overlays that protect document ownership without obscuring underlying content.
  • Position and Rotation ControlPlace watermarks at center, corners, or diagonal positions with configurable rotation angles, creating professional overlay patterns suitable for draft marking and confidentiality labeling.
  • Per-Page ApplicationChoose to apply watermarks to all pages or select specific pages for watermarking, enabling partial document protection for mixed-content PDFs.
  • Transparency PreservationWatermarks are rendered with configurable opacity levels, allowing content beneath the watermark to remain readable while still indicating document status or ownership.

Architecture

The watermark tool uses the browser's Canvas API for text rendering and PDF manipulation libraries for page overlay composition. Watermark text is rendered on a transparent canvas layer and composited over each PDF page during output generation.

Frequently Asked Questions

Can I use image watermarks?

The current implementation supports text-based watermarks only. Image watermark support is planned for a future release.

Can watermarks be removed?

Text watermarks applied as overlays can potentially be removed by skilled users with PDF editing tools. For stronger protection, consider combining watermarks with PDF encryption.

Does the watermark affect print quality?

Watermarks are rendered at the same resolution as the underlying PDF content. At full opacity, they print clearly. At reduced opacity, they appear as subtle overlays.

Is my PDF data stored?

No. All uploaded PDF files, watermark configurations, and watermarked output are processed entirely within your browser. No document content is transmitted to external servers.