PDF Watermark
Add custom text watermarks to every page of your PDF. Adjust font size, opacity, rotation, color, and placement. 100% local browser processing.
1. Upload PDF Document
Click to upload or drag and drop
Upload a PDF file up to 50MB
2. Watermark Settings
How In-Browser PDF Watermarking Protects Intellectual Property
Stamp confidential notices, draft markers, and copyright tags directly into the PDF content stream:
True PDF-Lib Vector Stamping
Watermarks are rendered as native vector text operators overlaid onto each page's bounding box, remaining crisp at any zoom level without pixelation.
Diagonal & Grid Tiling
Apply a classic -45° diagonal confidential stamp across the center or tile a 3x3 repeating security grid to prevent unauthorized document cropping and copying.
Zero Server Uploads
Confidential business NDAs, unreleased manuscripts, and financial audits are processed 100% locally in your browser memory for maximum privacy.
Frequently Asked Questions
Everything you need to know about stamping watermarks on PDF files.
Can watermarks be easily removed by viewers?
Our tool embeds the watermark text directly into the compiled PDF page content streams, making it permanent for standard PDF readers and printing.
What is the recommended opacity for draft watermarks?
An opacity between 20% and 30% provides high visibility for legal protection while ensuring underlying document text remains easy to read.
Does this tool watermark all pages in a multi-page PDF?
Yes. The watermark configuration is automatically applied across every single page in your document.