How WatermarkPDF Works

Adding watermarks to your PDF documents is simple, secure, and instant. Here's how our privacy-first tool works.

Drag and drop your PDF file or click to browse. Your file stays on your device.

Customize your watermark text, position, opacity, size, color, and rotation.

Click to process and your watermarked PDF downloads instantly to your device.

Start by uploading your PDF file using one of these methods:

Privacy Note: Your file is loaded into your browser's memory only. It's never uploaded to our servers or transmitted over the internet.

Customize your watermark with these options:

Text: Enter your watermark text (up to 50 characters)
Position: Choose from 5 positions (top-left, top-right, center, bottom-left, bottom-right)
Opacity: Adjust transparency from 10% to 100%
Font Size: Set size from 12px to 72px
Color: Pick from preset colors or choose a custom color
Rotation: Rotate the watermark from 0° to 360°

Once you're satisfied with your settings:

Processing Time: Usually takes 1-3 seconds depending on file size and complexity.

All processing happens in your browser using client-side JavaScript. Your files never leave your device, ensuring complete privacy and security.

No uploads, no server delays, no waiting. Your PDFs are watermarked instantly using advanced browser-based processing technology.

Uses the pdf-lib library for precise watermark placement while preserving the original quality and formatting of your PDF documents.

WatermarkPDF works in all modern browsers that support the following features:

Make sure you're uploading a valid PDF file. The tool only accepts .pdf files. Try refreshing the page and uploading again.

Large files or complex PDFs may take longer to process. Try with a smaller file or close other browser tabs to free up memory.

Check your browser's download settings and popup blockers. The download should start automatically after processing completes.