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Add PDF Watermark

Add text watermarks to every page of a PDF. Control font, size, opacity, rotation and position. 100% browser-based.

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Drag & Drop PDF here

PDF files only · Click to browse

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v2.4.0-Stable
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Processed Today

0ms

Latency

100%

Browser-Based

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100% Private

Nothing uploaded — all browser-based.

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Use immediately, no account needed.

All Pages

Watermark applied to every page.

Knowledge Base

Frequently Asked Questions

Can I add a watermark to every page of a PDF?

Yes. The watermark applies to all pages by default. Customize text, font size, opacity, rotation angle and position for each placement.

Can I make a watermark semi-transparent?

Yes. The opacity slider from 10% to 100% controls transparency. 20-30% opacity is typical for watermarks that are visible but not distracting.

Can I position the watermark anywhere on the page?

Yes. Choose center, diagonal (across the full page), or specific corner positions. Diagonal placement is the most tamper-resistant option.

Is adding a PDF watermark free?

Yes, completely free. pdf-lib runs in your browser with no file size limits or signup requirements.