Add Watermark to PDF
Stamp custom text watermark onto all pages of your PDF document with custom transparency and rotation.
Select PDF File
or drag and drop PDF here
About Add Watermark Online
Add text or image watermarks to your PDF documents to protect your copyright online for free.
How to Use Add Watermark
Upload PDF File
Select the PDF document you wish to protect with a watermark.
Customize Watermark
Type text or upload an image logo, then configure transparency, size, position, and rotation.
Apply & Download
Apply the watermark and download your protected PDF document.
Specifications & System Limits
100% Client-Side Privacy
Files are processed entirely within your browser memory via WebAssembly. Your documents never touch external servers.
Super Fast & No Waiting
Instant high-speed conversion with ultra-low latency. Never wait in arbitrary processing queues.
100% Free & No Watermarks
All PDF tools are accessible free of charge without watermarks, hidden paywalls, or required registration.
Frequently Asked Questions (FAQ)
Yes, you can customize the opacity of text or image watermarks so they protect your document without covering important content.
Yes. All processing is done 100% locally in your browser. Neither your PDF nor your logo is uploaded to the internet.
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About Add Watermark Online
Add text or image watermarks to your PDF documents to protect your copyright online for free.
How to Use Add Watermark
Upload PDF File
Select the PDF document you wish to protect with a watermark.
Customize Watermark
Type text or upload an image logo, then configure transparency, size, position, and rotation.
Apply & Download
Apply the watermark and download your protected PDF document.
Specifications & System Limits
100% Client-Side Privacy
Files are processed entirely within your browser memory via WebAssembly. Your documents never touch external servers.
Super Fast & Reliable
Instant high-speed conversion with ultra-low latency. Never wait in arbitrary processing queues.
100% Free & No Watermark
All tools on KAOpdf are completely free with no watermarks, no file limits, and no account registration required.
Frequently Asked Questions (FAQ)
Can I adjust watermark transparency?+
Yes, you can customize the opacity of text or image watermarks so they protect your document without covering important content.
Is my corporate logo safe?+
Yes. All processing is done 100% locally in your browser. Neither your PDF nor your logo is uploaded to the internet.