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WATERMARK • STAMP • FREE

ADD WATERMARK TO PDF

Add custom text watermarks to your PDF files. Control font size, color, opacity, and position. 100% in your browser.

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tuneWATERMARK SETTINGS

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100% CLIENT-SIDE
PDFs never leave your browser

HOW IT WORKS

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UPLOAD PDF

Drop or select the PDF file you want to add a watermark to. Any PDF size is supported.

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CUSTOMIZE WATERMARK

Set your watermark text, font size, color, opacity, position, and which pages to apply it to.

download

DOWNLOAD

Get your watermarked PDF instantly. All original content is preserved with the watermark overlaid.

WHY USE OUR PDF WATERMARK TOOL?

FULL CUSTOMIZATION

YOUR WATERMARK, YOUR WAY

Control every aspect of your watermark: text, font size, color, opacity, position, and rotation. Apply to all pages or just the ones you need.

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LIVE PREVIEW

See exactly how your watermark will look before applying. Adjust settings in real time.

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TOTAL PRIVACY

Files never leave your device. No server processing, no data collection. Your documents stay private.

all_inclusive

NO LIMITS

Watermark any PDF regardless of size or page count. No restrictions, no signup, completely free.

HOW TO ADD A WATERMARK TO PDF FILES ONLINE

Adding a watermark to PDF documents is essential for protecting intellectual property, marking documents as confidential, or branding your content. Whether you need to stamp PDF files with "DRAFT", "CONFIDENTIAL", or your company name, our free online PDF watermark tool gives you complete control over the watermark appearance.

Our tool uses pdf-lib, a powerful open-source library, to add text watermarks directly in the browser. This means your sensitive documents never leave your device. You can customize the watermark text, adjust the font size from 20 to 100 points, pick any color, set opacity from 10% to 100%, and choose from four positioning options including a diagonal watermark that rotates text at 45 degrees.

Unlike many online watermark tools that require server uploads and charge for premium features, our PDF watermark tool is completely free with no restrictions. You can apply watermarks to all pages, only the first page, or specify a custom page range. The output preserves all original formatting, fonts, images, and interactive elements from your source PDF.

FREQUENTLY ASKED QUESTIONS

How do I add a watermark to a PDF online?expand_more
Upload your PDF file, enter your watermark text (e.g., "CONFIDENTIAL", "DRAFT", or your company name), customize the font size, color, opacity, and position, then click Download. Your watermarked PDF is ready instantly.
Can I add a diagonal watermark to my PDF?expand_more
Yes! Select the "Diagonal" position option to rotate your watermark text at 45 degrees across the page. This is the most common watermark style for marking documents as confidential or draft.
Can I watermark only specific pages?expand_more
Absolutely. Choose "All Pages" to watermark every page, "First Page Only" for just the cover, or "Custom Range" to specify exact pages (e.g., "1-3, 5, 7-10"). This gives you full control over which pages receive the watermark.
Are my PDF files uploaded to a server?expand_more
No. Everything happens locally in your browser using the pdf-lib JavaScript library. Your files never leave your device, ensuring complete privacy and security for sensitive documents.
Will the watermark affect the original text quality?expand_more
Not at all. The watermark is overlaid on top of your existing content. All original text, images, fonts, and layouts remain perfectly intact. The watermark simply adds a semi-transparent text layer.
Can I adjust the transparency of the watermark?expand_more
Yes, use the opacity slider to set transparency from 10% (very subtle) to 100% (fully opaque). The default is 30%, which provides a visible but non-intrusive watermark that does not obscure the underlying content.