Add Watermark is a free online tool that stamps text or an image watermark onto a PDF. Upload your file, set the text, position, and opacity, and download the watermarked PDF — no signup and no software to install.

Your files are processed securely and deleted automatically after editing, so your documents stay private. It works in any browser on desktop and mobile.

How to add a watermark to a PDF

  1. Upload or drag your PDF into the box.
  2. Enter your watermark text and choose its position and opacity.
  3. Click Save & Download to get your watermarked PDF.

FAQ

Is it free? Yes — adding a watermark is completely free with no signup.

Can I control the opacity? Yes. You can set how light or bold the watermark appears.

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