Free Online PDF Watermark Tool - Add Text Watermark to PDF

PDF Watermark Tool

Instantly add professional text watermarks to any PDF document. Works with encrypted files. 100% private - no data leaves your device.

Add Watermark to PDF

Upload your PDF file and customize your watermark text, size, and opacity

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Click to upload PDF or drag & drop
Supports all PDF files including password protected documents
50px
30%
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What is a PDF Watermark Tool?

A PDF watermark tool enables you to overlay semi-transparent text or images onto PDF documents, serving multiple professional purposes including document protection, branding, and legal compliance. This online tool processes everything locally in your web browser using PDF-lib, ensuring maximum privacy and security.

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100% Private

All processing happens in your browser. No files are uploaded to any servers.

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Lightning Fast

Multiple watermark positions applied simultaneously across all pages instantly.

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Mobile Ready

Fully responsive design works perfectly on phones, tablets, and desktops.

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Encrypted PDFs

Handles password-protected and encrypted PDF files seamlessly.

Why Add Watermarks to PDF Documents?

  • Protect sensitive information from unauthorized distribution
  • Brand business documents with company logos and names
  • Mark drafts to prevent premature distribution
  • Legal compliance - copyright notices and ownership marking
  • Professional appearance for proposals and presentations

Key Features of Our PDF Watermark Tool

Unlike desktop software requiring installation, this browser-based solution offers:

  • Customizable text, font size (20px-100px), and opacity (10%-90%)
  • Strategic multi-position watermark placement (diagonal coverage)
  • Multiple watermark instances per page for maximum visibility
  • Rotation angles (-45°, 45°, -30°) for professional appearance
  • Real-time preview and file information display
  • Progress tracking during processing

Frequently Asked Questions (FAQ)

Is this PDF watermark tool completely free?
Yes! Our tool is 100% free with no hidden fees, subscriptions, or premium features. There's no limit on file size or number of watermarks you can apply.
Are my PDF files uploaded to a server?
Absolutely not! All processing occurs locally in your web browser using the PDF-lib JavaScript library. Your files never leave your device and cannot be accessed by us or any third parties.
Does it work with password-protected PDFs?
Yes! The tool automatically detects encrypted PDFs and bypasses encryption restrictions using ignoreEncryption: true option. Enable "Ignore PDF encryption" for best results.
What browsers are supported?
Works perfectly on all modern browsers: Chrome, Firefox, Safari, Edge (latest versions). Mobile browsers on iOS and Android are fully supported with touch-friendly interface.
Is there a file size limit?
No artificial limits! The only constraint is your browser's memory capacity. Successfully tested with files up to 500MB and 1000+ pages.
Can I customize watermark appearance?
Absolutely! Adjust text content, font size (20-100px), opacity (10-90%), and automatic multi-position placement with rotation angles for professional results.
What happens to the original file?
Your original PDF remains unchanged. The tool creates a new watermarked PDF for download. Browser memory is automatically cleaned when you navigate away.

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