Add Watermark to PDF
Stamp text watermarks across all pages with custom angle, transparency, and size.
Select PDF file to watermark
Drop your PDF here to apply a custom watermark stamp
How to use Watermark PDF in 3 easy steps
No software installation required. 100% free and runs smoothly on mobile, tablet, or desktop.
1. Select PDF File
Upload the document you want to stamp with a watermark.
2. Customize Text & Transparency
Type your message (e.g. Confidential), set opacity, font size, and rotation angle.
3. Apply & Download
Generate your watermarked document instantly in your browser.
Guaranteed Document Confidentiality
Your files stay on your machine. Client-side tools do not send your files to our servers.
Frequently Asked Questions
Everything you need to know about Watermark PDF on HoudiniPDF.
Can the watermark be removed easily by others?
The watermark is rendered directly into the PDF content stream, making it non-trivial to remove without dedicated editing tools.
Does it watermark every page in the document?
Yes, the watermark is stamped across every single page with the exact same positioning.
Can I adjust how transparent the watermark is?
Yes, you can adjust the opacity slider from 5% (very subtle) to 80% (high contrast).
Are confidential documents safe?
Yes. Watermarking executes entirely in your browser memory. Nothing is uploaded to our servers.
Can I combine this with password protection?
Yes! After watermarking, you can protect your document using our "Protect PDF" tool.
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