Add Watermark to PDF: Free Online PDF Watermark Tool
Protect your documents with custom watermarks — text or image overlays — 100% private, no uploads, all in your browser.
Watermarking your PDF documents is essential for protecting intellectual property, branding, and preventing unauthorized use. Our PDF watermark tool allows you to add custom text or image watermarks to any PDF document. Whether you need to mark documents as "Confidential," "Draft," or add your company logo, this tool provides complete control over watermark appearance, position, opacity, and rotation. The entire process happens locally in your browser — no files are uploaded to any server, ensuring complete privacy and security for your sensitive documents.
🔒 100% Client-Side Processing
📝 Text & Image Watermarks
🎨 Custom Colors & Opacity
🔄 Rotate Any Angle
📍 Multiple Position Options
📄 Apply to All Pages
💾 Download Watermarked PDF
🆓 Completely Free
💡 How it works: Upload your PDF, choose between text or image watermark, customize appearance (text, color, opacity, rotation, position), and click "Apply Watermark". Your watermarked PDF will be generated instantly and ready for download. Perfect for branding, confidentiality notices, and document protection.
⚠️ Note: Watermarks are added as overlays on your PDF pages. They help deter unauthorized use but are not a substitute for digital rights management (DRM). For best results, use semi-transparent watermarks placed strategically across the page.
💧 Add Watermark to PDF
📄 Protect your PDF with custom text or image watermarks.
or drag & drop a PDF file here
Frequently Asked Questions about PDF Watermarking
What types of watermarks can I add?
You can add both text watermarks (custom text with customizable font, color, opacity, rotation) and image watermarks (upload PNG, JPG, or WebP images). Image watermarks are great for adding logos or signatures to your documents.
Can I control watermark opacity and position?
Yes! You have full control over opacity (0-100%), rotation angle (-45 to 45 degrees), and position (center, corners, or tiled repeating pattern). This allows you to create subtle or prominent watermarks as needed.
Will the watermark be added to all pages?
You can choose to add the watermark to all pages or only the first page. This is useful when you want to mark the document as confidential on every page or only add a cover watermark.
Is my document secure during watermarking?
Absolutely! The entire watermarking process happens locally in your browser using pdf-lib. Your PDF and watermark images never leave your computer — no uploads to any server. This ensures complete privacy for your confidential documents.
What image formats are supported for watermarks?
We support PNG, JPG, JPEG, and WebP image formats. PNG images with transparency work best for clean watermark overlays without backgrounds. For best results, use logos or signatures with transparent backgrounds.
Can I remove a watermark after adding it?
Watermarks become permanent once applied to the PDF. If you need to make changes, simply upload the original PDF and apply a new watermark. The tool always works with your original file, so you can experiment freely.
Will this work on mobile devices?
Yes! The tool is fully responsive and works on smartphones and tablets. You can upload PDFs from your device, customize watermarks, and download the watermarked document directly in your mobile browser.