Advanced PDF Pages Deleter

1. PDF Preview Functionality:
   • Uses PDF.js to render PDF thumbnails and first page preview
   • Interactive page selection with visual feedback
2. Multiple Selection Modes:
   • Individual page selection (click thumbnails or enter page numbers)
   • Range selection (from-to)
   • Percentage-based selection (keep X% of pages)
   • “Keep mode” (inverse selection – delete all except selected)
3. Robust Error Handling:
   • File type validation (PDF only)
   • File size limit (50MB)
   • Page number validation
   • Range validation
   • Percentage validation
4. Responsive Design:
   • Works on desktop and mobile devices
   • Adapts layout for smaller screens
5. PDF Processing:
   • Uses PDF-LIB for actual page deletion
   • Creates new PDF with only selected pages kept
6. User Experience:
   • Drag and drop support
   • Loading indicators
   • Success/error messages
   • Download button for processed PDF

Implementation Notes

1. The tool requires internet connection to load PDF.js and PDF-LIB libraries from CDN.
2. For production use, you might want to:
   • Host the libraries locally
   • Add server-side processing for very large files
   • Implement user authentication if needed
   • Add more advanced features like rotation or watermarking
3. The current implementation has a 50MB file size limit which can be adjusted.

This tool provides a complete, production-ready solution for deleting pages from PDFs with a user-friendly interface and comprehensive error handling.