Watermark PDF
Stamp customized text or image watermarks with angle and opacity control.
Start using Watermark PDF
Your files stay strictly inside your browser. No files are uploaded to any server or cloud storage.
Open in Studio WorkspaceHow to use Watermark PDF
1. Load PDF
Select the PDF you want to protect.
2. Configure Watermark
Type your text, adjust rotation angle, opacity slider, and color.
3. Stamp & Export
Download your watermarked document.
Technical Architecture & Privacy
Protect your intellectual property by applying customizable text or image watermarks ("CONFIDENTIAL", "DRAFT", company logos) with precise rotation, opacity, and positioning.
Unlike conventional PDF websites that send your personal tax forms, legal agreements, and corporate contracts to third-party cloud infrastructure, PDFolio operates under a Zero-Server Architecture. Your documents are decoded into pure memory buffers (Uint8Array) inside your browser's dedicated JavaScript runtime or Web Worker. When you click download, the newly assembled PDF is produced directly from memory into your Downloads folder.
Frequently Asked Questions
Can I adjust the transparency?
Yes, opacity is adjustable from 5% (subtle background wash) to 100% (solid text).