Is this PDF watermark tool free?

Yes, 100% free with no signup required. All watermarking happens in your browser using pdf-lib. No file is uploaded to any server.

Does watermarking reduce PDF quality?

No. Text watermarks are vector-based and do not affect image or text quality. Image watermarks are embedded at the uploaded resolution.

Add Watermark to PDF Free Online — Text & Image Watermark Tool

Watermark Guides & Tips

Learn when and how to use PDF watermarks effectively

PROTECTION

Why Every Professional Should Watermark Their PDFs

Watermarks protect your intellectual property, establish ownership, and deter unauthorized distribution. Here's a guide to using them effectively...

DESIGN

Text vs Image Watermark: Which Should You Use?

Text watermarks are universally compatible and crisp at any resolution. Image watermarks let you embed your logo. Here's how to choose...

DESIGN

The Right Watermark Opacity: Visible vs Subtle

Too transparent and your watermark is invisible. Too dark and it obscures content. Here's the science behind the perfect opacity setting...

LEGAL

Watermarking Legal & Confidential Documents

CONFIDENTIAL, DRAFT, ATTORNEY-CLIENT PRIVILEGE — understanding which watermark belongs on which document type, and why it matters legally...

PRODUCTIVITY

Batch Watermarking: Stamp 30 PDFs in 60 Seconds

Manually watermarking dozens of PDFs is tedious. Batch mode processes all files simultaneously in your browser — no queue, no waiting...

BRANDING

Adding Your Logo to PDFs as a Watermark

Turn every PDF you share into a branded document. PNG logos with transparent backgrounds work best. Here's the complete guide to logo watermarking...

Frequently Asked Questions

Common questions about PDF watermarking

Is this PDF watermark tool completely free? ▼

Yes, 100% free with no signup, no account, and no file size limit. All processing happens in your browser using pdf-lib. Your PDFs never leave your device.

Can I add an image or logo as a watermark? ▼

Yes. Use the Image Watermark tab, upload your PNG or JPG logo, then adjust opacity and scale. PNG files with transparent backgrounds produce the cleanest results.

Will the watermark reduce PDF quality? ▼

Text watermarks are vector-based and add no quality loss. Image watermarks embed at the uploaded resolution. The PDF content (text, graphics) is not modified.

Can I watermark multiple PDFs at once? ▼

Yes! The Batch Mode tab supports up to 30 PDFs simultaneously. All files are processed in your browser with the same watermark settings, and each file can be downloaded individually.

What is the tile / repeat watermark mode? ▼

Tile mode repeats the watermark in a grid pattern across the entire page, ensuring no area of the document is unwatermarked. This is the most effective mode for copyright protection.

Can I remove a watermark from a PDF? ▼

This tool adds watermarks only. If you added a watermark using this tool, simply re-process the original (unwatermarked) file. Removing watermarks from third-party PDFs is not supported.

PDF Watermark Studio