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Add PDF Watermark

Free online PDF watermark tool. Add custom text or image watermarks to your PDF files. Control position, opacity, and size. Perfect for branding, marking drafts, or protecting documents. All processing in your browser.

100% Private (In-Browser)Instant Web Worker SpeedZero Server Upload
Add PDF Watermark by Privacy-First Toolbox is a 100% free, client-side browser utility. It processes your files locally on your computer or smartphone using HTML5 and Web Workers—zero bytes of your files or data are ever uploaded to any external server.

Key Features

  • Text & image watermarks
  • Adjustable opacity
  • 8 position options
  • Diagonal placement
  • Custom font size
  • 100% private & secure

Common Use Cases

  • Mark draft documents
  • Add company branding
  • Protect content
  • Label confidential files

How to Use Add PDF Watermark

Three simple steps to process your files securely in browser.

1

Select Your File

Drag and drop or browse your local file into the secure tool workspace.

2

Configure Options

Set quality, output format, or formatting options for your task.

3

Instant Download

Save your processed output immediately with zero server upload.

Frequently Asked Questions

🔒100% Client-Side: Your files never leave your device.