Add Watermark to PDF Online

Stamp an image or text over your PDF with live preview. Customize color, position, font style, size, and opacity. 100% Free.

Select PDF file

Live Document Preview: Changes apply live inside PDF bounds

Watermark Options

Watermark Text

Position & Alignment

Watermark Color

Font Family

Size: 48px

Opacity: 40%

Rotation: 45°

💡 How to Add Watermark to PDF Documents

Step 1: Select PDF

Select or drag and drop your PDF file to load live document preview cards.

Step 2: Customize Stamp

Type custom text (e.g., CONFIDENTIAL, DRAFT), adjust font, rotation angle, and opacity level.

Step 3: Download PDF

Click Add Watermark to stamp every page and download your protected PDF file.

Why Watermark PDFs with The PDF Lab?

🎨 Real-Time Live Document Preview

Watch your watermark text, position, opacity, and rotation update live on page previews before saving.

🛡️ Permanent Vector Baking

Watermarks are baked directly into the PDF content stream so they cannot be removed or hidden by standard viewers.

Frequently Asked Questions

Can I watermark all pages at once? Yes! The watermark is automatically applied across every page of your PDF document.

Can I adjust transparency so text remains readable underneath? Yes! Use the Opacity slider (10% to 100%) to create subtle, translucent watermark stamps.