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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.

How Watermark Pdf Works in Your Browser

The ToolsForgess PDF watermark tool overlays customizable text watermarks on individual pages or entire PDF documents. Configure the watermark text, font size, opacity, rotation angle, and position to create draft stamps, confidential labels, or branding marks. The engine renders the watermark text using the browser's Canvas API and composites it over each page during the PDF assembly step — all within the browser sandbox. No PDF content or watermark configuration is transmitted to any server. This tool is essential for marking draft documents, protecting intellectual property before distribution, adding branding to client-facing reports, and creating confidential or internal-use-only stamps on sensitive documents.

Key Features

  • Configure watermark text, font size, color, opacity, and rotation angle for precise visual control. Create subtle semi-transparent overlays or bold visible stamps depending on your requirements.
  • Position the watermark at any location on the page — center, corners, or custom coordinates. The engine supports diagonal watermark placement for maximum coverage.
  • Apply the watermark to all pages or select specific page ranges. Individual page selection enables targeted watermarking for mixed-content documents.
  • All watermark rendering and PDF compositing occur entirely within the browser. No document content or watermark text is transmitted to any external server.

Frequently Asked Questions

Does the watermark affect PDF text selectability?
The watermark is rendered as an overlay on the page content layer. Underlying text remains selectable and searchable. The watermark does not alter the original text data in the PDF.
Can I remove watermarks after adding them?
Watermarks applied by this tool are composited into the page content. To remove a watermark, use the original unwatermarked PDF. Always keep a backup before applying watermarks to important documents.
Does the tool support image watermarks?
The current implementation supports text-based watermarks. For image watermarks, consider using dedicated PDF editing software that supports image overlay operations.
Is my PDF content secure during watermarking?
All processing occurs entirely within the browser. No PDF content, watermark text, or document metadata is transmitted to any server. Your files remain completely private.

All data processing for Watermark Pdf runs 100% locally in your browser using client-side JavaScript. No data is 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.