# PDF Tools - AI Information File

## Overview
PDF Tools is a comprehensive web application for PDF manipulation and conversion. This application provides professional-grade PDF processing capabilities through an intuitive user interface.

## Core Functionality
- **Document Conversion**: Convert web pages, Word documents, and Apple Pages to PDF
- **PDF Organization**: Split, merge, compress, and rotate PDF documents
- **Security Features**: Encrypt, decrypt, add watermarks, flatten forms, remove metadata, and manage permissions
- **User Authentication**: Secure user accounts with conversion history

## Technical Stack
- **Frontend**: Svelte with Tailwind CSS
- **Backend**: Node.js with Express
- **PDF Processing**: pdf-lib library for client-side operations
- **Authentication**: Supabase for user management
- **File Handling**: Multer for server-side file uploads

## API Endpoints
### Conversion Tools
- POST /api/pdf/web-to-pdf - Convert websites to PDF
- POST /api/pdf/word-to-pdf - Convert Word documents to PDF
- POST /api/pdf/pages-to-pdf - Convert Apple Pages to PDF

### Organization Tools
- POST /api/pdf/split - Extract specific pages from PDFs
- POST /api/pdf/merge - Combine multiple PDFs
- POST /api/pdf/compress - Reduce PDF file sizes
- POST /api/pdf/rotate - Rotate PDF pages

### Security Tools
- POST /api/pdf/encrypt - Add password protection
- POST /api/pdf/decrypt - Remove password protection
- POST /api/pdf/watermark - Add text watermarks
- POST /api/pdf/flatten - Make forms non-editable
- POST /api/pdf/remove-metadata - Strip document metadata
- POST /api/pdf/change-permissions - Modify user permissions

## Features
- **Responsive Design**: Mobile-first interface with dropdown navigation
- **Drag & Drop**: Intuitive file upload interface
- **Batch Processing**: Handle multiple files simultaneously
- **Page Range Selection**: Precise control over page operations
- **Real-time Feedback**: Progress indicators and error handling
- **SEO Optimized**: Dynamic meta tags and structured navigation

## Use Cases
- **Business**: Secure document processing, form finalization
- **Education**: Document organization and sharing
- **Personal**: File compression, format conversion
- **Development**: API integration for PDF workflows

## Privacy & Security
- Client-side processing where possible
- Secure file handling with cleanup
- User authentication and session management
- No permanent file storage on servers

## Deployment
- Frontend: Svelte development server
- Backend: Node.js Express server
- Database: Supabase PostgreSQL
- File Processing: In-memory operations with automatic cleanup

This application serves as a complete PDF processing solution suitable for both individual users and business integration through its comprehensive API.