Add Watermark to PDF Online Free
Watermark PDF online for free. Add a text watermark to every page with custom font size, opacity, and position — in-browser, no upload.
Drop a PDF file here
Add watermark to all pages
Max 100 MB per file
Last updated May 2026
Pro Tip
For the best protection, use diagonal tiled watermarks which are harder to remove. Lower opacity (20-30%) keeps documents readable while still showing the watermark clearly.
How to Use PDF Watermark Tool
1
Upload Your PDF
Drag and drop your PDF file into the upload area, or click to browse and select a file from your device.
2
Enter Watermark Text
Type the text you want to use as a watermark, such as 'CONFIDENTIAL', 'DRAFT', or your company name.
3
Customize Appearance
Adjust the font size, opacity, and position of your watermark to achieve the perfect look.
4
Download Watermarked PDF
Click the button to add the watermark and download your protected PDF document.
Why Use Our PDF Watermark Tool?
Custom Text
Add any text as a watermark to protect your documents.
Adjustable Opacity
Control transparency so content remains readable.
Multiple Positions
Choose diagonal tiled or center placement for your watermark.
100% Free
No hidden charges or premium features locked behind paywalls.
Privacy First
Files are processed in your browser and never uploaded to servers.
Works Everywhere
Compatible with desktop, tablet, and mobile browsers.