Add Watermark
Stamp a custom diagonal watermark across all pages of your PDF. Processed completely offline for maximum privacy.
Watermark Options
Upload a PDF
Drag & drop your file to add a watermark.
How to Watermark a PDF?
Upload PDF
Select or drag and drop any PDF document into the tool area above.
Customize Stamp
Type your custom watermark text, pick a color (Red, Blue, or Gray), and adjust the transparency slider.
Apply & Download
Click apply, and your diagonal watermark will be stamped across every page instantly.
Why Use Our PDF Watermark Tool?
Protect your intellectual property and mark document statuses with ease.
100% Private & Secure
Your contracts and reports stay confidential. The stamping process happens entirely offline inside your web browser without uploading documents to a cloud server.
Multi-Page Stamping
No need to manually edit individual pages. Our tool instantly loops through every page of your PDF and applies a perfectly centered, professional diagonal watermark.
Frequently Asked Questions
Are my sensitive PDF documents uploaded to a server?
No! Your data remains completely private. The PDF watermarking process happens entirely client-side inside your web browser using your device's memory. Your files are never uploaded or stored anywhere.
Where does the watermark appear on the pages?
The tool automatically stamps a professional diagonal watermark right across the center of every page in your PDF document, making it clearly visible yet readable.
Is this PDF watermark tool free?
Yes, it is 100% free forever with no limits, no sign-ups required, and no hidden watermarks of our own added to your documents.