Add Watermark to PDF Online Free

Add custom text watermarks to protect your documents

Drop PDF to watermark

Upload multiple PDFs or Images

Processed locally in your browser. Your files never leave your device.
Processed locally in your browser

Your files never leave your device. 100% private and secure.

How It Works

1

Upload PDF

Open the PDF you want to valid/stamp.

2

Customize Watermark

Type your text, choose color, rotation, and opacity settings.

3

Apply

Download the stamped PDF with your custom watermark applied to all pages.

Frequently Asked Questions

Can I customize the watermark appearance?
Yes! Adjust text, font size, opacity, and rotation angle to create your perfect watermark.
Is the watermark applied to all pages?
Yes, the watermark is automatically applied to every page of your PDF.
Can I add image watermarks?
Currently we support text watermarks. Image watermarks may be added in a future update.
Can watermarks be removed later?
Watermarks are permanently embedded in the PDF. Keep your original if you need an unmarked version.

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.

Key Features

Custom text watermarks (e.g., CONFIDENTIAL)
Adjust size, color, rotation, and opacity
Apply to all pages instantly
Protect intellectual property
Browser-based security