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Advanced PDF Watermarker

Add Watermark to PDF Online Free

Protect your documents by adding custom text or logo watermarks. Fine-tune opacity, rotation, and positioning with live real-time preview.

Watermark Settings

Document Preview

Click to Upload PDF

Apply custom text or image watermark instantly

Why Choose FileWorks Watermarker?

High-performance client-side security and customization.

100% Client-Side Privacy

No PDF file uploads to external servers. Your confidential business files stay safe on your computer.

Precision Angle & Opacity

Full control over stamp transparency, placement, scale, and custom rotation angles.

High-Speed Processing

Stamp multi-page PDF files instantly without queue delays or bandwidth limitations.

Stamp PDF Documents Safely Online

Watermarking sensitive PDF files protects your intellectual property, prevents unauthorized redistribution, and clearly labels confidential contracts or draft versions. Our **PDF Watermark Tool** lets you apply text stamps like "CONFIDENTIAL", "DRAFT", or custom corporate logos directly in your web browser.

Powered by browser WebAssembly engines (`pdf-lib`), your documents remain strictly on your device during the entire process, ensuring complete GDPR and corporate privacy compliance.

How to Watermark a PDF in 3 Easy Steps

  1. Upload Your PDF: Click or drag your PDF document into the preview box.
  2. Customize Stamp Settings: Choose text or image logo mode, adjust opacity slider, angle, and size.
  3. Export Watermarked File: Click "Apply & Download" to save your watermarked PDF instantly.