Add Watermark to PDF

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Drag & Drop your PDF document here

or click to browse files (100% Client-Side Processing)

document.pdf
Ready to be stamped.

Stamping Document...

Applying text layer to all pages...

Watermark Applied!

Your stamped document is ready for download.

Best Free PDF Watermark Tool Online

Welcome to the most secure, reliable, and user-friendly PDF Watermarking utility available. Whether you need to mark a legal document as "CONFIDENTIAL", stamp a script as a "DRAFT", or brand your eBook to prevent unauthorized copying, our browser-based tool delivers professional results instantly. Designed for utmost privacy, your files are processed directly on your device without ever being uploaded to a cloud server.

Why Use Our PDF Stamper?

🔒 Zero Data Harvesting

Unlike traditional online tools that require you to upload your sensitive contracts to their servers, our tool uses pdf-lib to manipulate the binary data locally inside your web browser. Your privacy is 100% guaranteed.

🎨 Complete Customization

You have full control over the output. Adjust the exact Hex color, set the transparency (opacity) so the text beneath remains readable, and rotate the stamp to any angle.

⚡ Lightning Fast Execution

Because you bypass internet upload and download queues, iterating over a massive 100-page PDF document and applying a watermark happens almost instantly.

How to Add a Watermark to a PDF

  1. Upload File: Drag and drop your target `.pdf` document into the secure upload zone at the top of the page.
  2. Configure Settings: Type your desired watermark text. Use the sliders to adjust the color, transparency, rotation, and size until it fits your needs.
  3. Stamp & Download: Click "Apply Watermark". Our engine will mathematically calculate the center of every page, embed the text vector, and provide a brand new file ready for immediate download.

Frequently Asked Questions (FAQ)

Is the watermark applied to every page?

Yes. The engine automatically detects the total number of pages in your document and applies your configured watermark to the exact center of every single page.

Can the watermark be easily removed by someone else?

Because the watermark is embedded directly into the PDF's vector stream as a core text object rather than a flimsy overlay, it cannot be easily removed by standard PDF readers, providing excellent protection against casual copying.

Is there a file size limit?

Because the processing and rendering happens within your browser's memory (RAM), the limit depends entirely on your device. Most modern computers and smartphones can comfortably handle stamping PDFs up to 50MB instantly.

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