🎯 Core Features:

• Drag & Drop Upload – Easy PDF file handling
• Custom Positioning – 6 different position options (top/bottom + left/center/right)
• Typography Control – Font family, size, and color customization
• Page Range Selection – Choose which pages to number
• Multiple Number Formats – Numbers, Roman numerals, alphabetical
• Custom Prefix/Suffix – Add custom text before/after numbers
• Total Page Display – Show “1 of 10” format

🚀 Advanced Features:

• Live Preview – See changes before applying
• Batch Processing – Handle multiple PDF files at once
• Preset System – Save and load your favorite configurations
• Configuration Export/Import – Share settings via JSON files
• Auto-save – Automatically saves your last used settings
• Keyboard Shortcuts – Ctrl+O (Open), Ctrl+S (Save), Ctrl+P (Preview)
• Progress Tracking – Visual progress bars for long operations
• Performance Monitoring – Optimized processing

🔒 Privacy & Security:

• 100% Client-side – All processing happens in your browser
• No uploads to servers – Your files never leave your device
• Instant processing – No waiting for server responses

🎨 User Experience:

• Responsive Design – Works on desktop and mobile
• Modern UI – Beautiful gradient design with smooth animations
• Real-time Feedback – Status messages and loading indicators
• Input Validation – Prevents errors with smart validation

📋 Technical Features:

• Uses PDF-lib.js for robust PDF manipulation
• Local storage for settings persistence
• Error handling and recovery
• Cross-browser compatibility