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GuideMarch 18, 2026

How to Add Watermark to PDF: Protect Your Documents

Whether you need to mark a document as "DRAFT", protect intellectual property, or add your company branding, adding a watermark to PDF is the most effective solution. This guide covers watermark types, best practices, and how to do it with PDFMASTER.

Why Use Watermarks?

  • Copyright protection -- Photographers, designers, and authors use watermarks to protect their work.
  • Document status -- Labels like "DRAFT", "CONFIDENTIAL", or "SAMPLE" clarify the document's purpose.
  • Brand identity -- Adding a company logo or name professionalizes corporate documents.
  • Deterring unauthorized distribution -- Watermarked documents can be traced back to their source.

Types of Watermarks

  • Text watermark -- "CONFIDENTIAL", "DRAFT", "SAMPLE", company name, or custom text. Most common and easiest to apply.
  • Image watermark -- Company logo or custom design. Ideal for brand recognition.
  • Diagonal watermark -- Text placed diagonally across the page. Visible across the entire document.

Add Watermark with PDFMASTER

  1. Open the tool -- Go to PDFMASTER Watermark PDF.
  2. Upload your PDF -- Drag and drop the document.
  3. Configure watermark -- Enter text, set font size, color, and opacity.
  4. Choose position -- Center, corner, or diagonal placement.
  5. Apply and download -- Watermark is applied to all pages. Download your PDF.

Tips for Effective Watermarks

  • Balance opacity -- Too dark makes content unreadable; too light is invisible. 15-30% opacity works best.
  • Use large font size -- The watermark should span enough of the page to be noticed.
  • Place diagonally -- 45-degree angle provides visibility without blocking content.
  • Choose gray tones -- Light gray works well with most document backgrounds.

With PDFMASTER, adding watermarks to PDF is free, instant, and completely private. Your files never leave your browser.

Add a watermark to your PDF now

Try PDFMASTER Watermark PDF