Add Watermark

Add a text watermark to every page of your PDF

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What is Add Watermark to PDF?

Add Watermark to PDF is a free browser-based tool that overlays custom text across every page of your PDF document. You can stamp words like "Confidential," "Draft," or "Sample" in any font size, color, and opacity to clearly communicate the status of your document. The watermark is rendered diagonally across each page for maximum visibility. This tool is built on the pdf-lib JavaScript library, so your document is processed entirely within your browser. No file is ever uploaded to a remote server, making it safe for sensitive corporate, legal, and personal files.

When to Use Add Watermark

Use this tool whenever you need to mark a PDF with a visible label to indicate its purpose or restrict its use. Common scenarios include:

  • Labeling draft proposals or reports so reviewers know the document is not final.
  • Stamping "Confidential" on financial statements, contracts, or internal memos.
  • Marking sample invoices or product catalogs shared with prospective clients.
  • Adding "Do Not Copy" to proprietary training materials or exam papers.
  • Branding documents with your company name or department before distribution.

How It Works

Upload your PDF by dragging it into the drop zone or using the file picker. Enter the watermark text and configure the appearance options such as font size, color, opacity, and rotation angle. Click apply, and the pdf-lib library draws the watermark text onto every page of your document directly inside your browser. The resulting PDF is available for immediate download. Because all processing is client-side, the tool works offline after the initial page load, requires no account, adds no extra branding of its own, and is entirely free to use.