Add Watermark to PDF Online Free
Add custom text watermarks to protect your documents
Drop PDF to watermark
Upload multiple PDFs or Images
Your files never leave your device. 100% private and secure.
How It Works
Upload PDF
Open the PDF you want to valid/stamp.
Customize Watermark
Type your text, choose color, rotation, and opacity settings.
Apply
Download the stamped PDF with your custom watermark applied to all pages.
Frequently Asked Questions
Can I customize the watermark appearance?▼
Is the watermark applied to all pages?▼
Can I add image watermarks?▼
Can watermarks be removed later?▼
About This Tool
Add watermarks to PDF documents with our free PDF watermark tool. Protect intellectual property, brand documents, or mark status with custom text watermarks. Our PDF watermarking tool lets you customize text, font size, opacity, color, and rotation angle. Apply watermarks like "CONFIDENTIAL", "DRAFT", "SAMPLE", or company names to all pages automatically. Perfect for protecting PDFs, branding proposals, or marking document status. Watermarks are permanently embedded and visible on every page. The browser-based tool processes files offline – zero uploads, complete security.
Why Use AeroPDF?
100% Private & Secure
Files are processed entirely in your browser. Nothing is uploaded to any server.
Lightning Fast
No waiting for uploads or downloads. Everything happens instantly on your device.
Works Everywhere
Use on any device with a modern browser. Windows, Mac, Linux, or mobile.