Security Tool
Add Watermark to PDF Documents Online
Stamp confidential labels, draft notices, copyright warnings, or company names across all pages with zero server uploads.
100% Client-Side Watermarking: Your document is watermarked entirely in your browser memory. No files are ever sent to a server.
Zero Server Uploads
Custom Text & Presets
Diagonal or Tiled Layout
Adjustable Opacity & Color
How to Use Add Watermark to PDF (Confidential, Draft, Custom Stamp) (Step-by-Step Guide)
No software installation required. Complete your task in 3 easy steps directly in your browser.
1
Upload PDF File
Select or drag your PDF document into the browser.
2
Customize Stamp
Type custom text, select angle, opacity, color, and diagonal or tiled layout.
3
Download Watermarked PDF
Click Apply and instantly download your watermarked document.
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Got Questions?
Frequently Asked Questions
Never! Watermark rendering is executed entirely inside your browser memory using local WebAssembly/JavaScript.