The Ultimate Offsite Private
PDF & Image Processing Suite
Convert PDF pages to high-resolution JPG images, watermark, merge, split, and compress files directly in browser RAM with zero privacy risk.
Merge PDF Files
Combine multiple PDF documents into a single organized file locally.
Drag & Drop your files here, or browse computer
Files never leave your device. 100% private client-side processing.
Queued Files (0)
How to Merge PDF Files Online Privately
Merging PDF files locally in your browser has never been safer. ZapDocu processes your files entirely inside your web browser using HTML5 Web Assembly and PDF-Lib JavaScript engines. Your documents are never uploaded to remote servers, cloud folders, or external API endpoints.
Select Files
Drag and drop your PDF or image files into the workspace dropzone above.
Local Processing
Click process. Your browser immediately compiles and modifies your files in RAM.
Instant Download
Download your output document directly to your computer or device instantly.
All Utility Tools & Landing Pages
Click any tool to load its dedicated workspace and SEO landing page.
Simple, Transparent Plans
Start free with up to 20 conversions every 24 hours, or upgrade for unlimited high-speed power.
- 20 Free Conversions every 24 hours
- 100% In-Browser Privacy
- Native PDF.js Page Rendering
- Unlimited Conversions (No daily cap)
- Priority processing & larger file batches
- 100% Ad-Free Experience