Free Tool to Add Watermark to PDF Securely

Protecting your intellectual property, labeling draft reports, and securing confidential files has never been easier. If you need to add watermark to PDF documents instantly, our free browser-based tool is the perfect solution. Unlike other tools that incorrectly chop off your text, our advanced engine mathematically auto-scales and aligns your custom text to fit perfectly from corner to corner.

How to Add Watermark to PDF Files

1. Upload Your Document: Click the upload zone or drag and drop your file to begin. Because this is a secure tool, you can add a watermark to a PDF without ever uploading your file to an external server.
2. Type Your Watermark Text: Enter the phrase you want stamped across your pages (e.g., CONFIDENTIAL, DRAFT, or COPYRIGHT).
3. Customize the Layout:
   • Perfect Diagonal (Recommended): Automatically stretches and angles the text to aim perfectly from the bottom-left to the top-right corner of the page.
   • Appearance: Adjust the opacity to make the text semi-transparent, and use the color picker to match your brand.
4. Stamp and Download: Click "Stamp Document." The tool will permanently embed your text into the exact geometric center of every page. Once finished, click the download button to save your newly protected PDF!