ZapDrop - Free Peer-to-Peer File Transfer

Zap it. Drop it. Share it.

A modern, secure, and completely free peer-to-peer file sharing application built with Next.js and WebRTC. Share files directly between browsers with no servers involved - ensuring complete privacy and security.

✨ Features

• 🔒 100% Private & Secure - Files transfer directly between browsers, never touching our servers
• ⚡ Lightning Fast - No upload delays, start sharing immediately with P2P connections
• 🔐 Password Protection - Optional password security for sensitive files
• 📱 Mobile Friendly - Works seamlessly on all devices including mobile browsers
• 🎨 Modern UI - Beautiful interface with dark mode support
• 📦 Multiple Files - Upload and share multiple files at once (auto-zipped for download)
• 📊 Real-time Progress - Monitor transfer progress for both uploaders and downloaders
• ⏸️ Pause & Resume - Download interruptions can be resumed from where they left off
• 🌐 Universal Access - Works in any modern browser without installations

🆓 Completely Free Deployment

This application can be deployed and run completely free forever using these platforms:

Free Hosting Options:

• Frontend: Vercel (unlimited deployments)
• Alternative: Netlify (100GB bandwidth/month)
• Alternative: GitHub Pages (static hosting)
• STUN Servers: Google's free STUN servers (included)
• Domain: Your custom domain or free subdomain

🚀 Quick Start

Prerequisites

• Node.js 18+
• npm or yarn

Local Development

# Clone the repository
git clone https://github.com/RajdeepKushwaha5/ZapDrop.git
cd zapdrop-app

# Install dependencies
npm install

# Run development server
npm run dev

# Open http://localhost:3000 in your browser

Environment Variables

Create a .env.local file in the root directory (optional):

# Optional: Custom STUN/TURN servers
CUSTOM_STUN_SERVER=stun:your-stun-server.com:19302
TURN_SERVER_URL=turn:your-turn-server.com:3478
TURN_SERVER_USERNAME=your-username
TURN_SERVER_CREDENTIAL=your-password

# Optional: Analytics
NEXT_PUBLIC_GA_ID=your-google-analytics-id

📦 Free Deployment Options

1. Vercel (Recommended - FREE Forever)

1. Fork this repository
2. Connect your GitHub account to Vercel
3. Import the project
4. Deploy (takes ~2 minutes)
5. Get your free .vercel.app domain or add your custom domain

Cost: $0/month forever ✅

2. Netlify (FREE Forever)

1. Fork this repository
2. Connect to Netlify
3. Build settings: npm run build and out folder
4. Deploy automatically

Cost: $0/month forever ✅

3. GitHub Pages (Static Only)

# Build static version
npm run build
npm run export

# Deploy to GitHub Pages
# (Upload the 'out' folder content)

Cost: $0/month forever ✅

🏗️ Architecture

┌─────────────────┐    WebRTC P2P     ┌─────────────────┐
│   Uploader      │◄─────────────────►│   Downloader    │
│   Browser       │                   │   Browser       │
└─────────────────┘                   └─────────────────┘
        │                                       │
        │ HTTPS API (ICE servers only)          │
        ▼                                       ▼
┌─────────────────────────────────────────────────────────┐
│              Next.js Server (FREE)                      │
│           - ICE server configuration                    │
│           - No file storage                            │
│           - No user data                               │
└─────────────────────────────────────────────────────────┘

🔧 Technology Stack

• Frontend: Next.js 15, React 19, TypeScript
• Styling: Tailwind CSS
• WebRTC: PeerJS (simplified WebRTC)
• File Handling: Web APIs (File API, Blob, ArrayBuffer)
• Streaming: Service Workers for download streaming
• State: React hooks and context
• Icons: Lucide React

🛡️ Security Features

• End-to-End Encryption: All data encrypted via WebRTC/DTLS
• No Server Storage: Files never touch our servers
• Password Protection: Optional AES-256 password protection
• No Tracking: No user data collected or stored
• Content Security Policy: XSS protection
• HTTPS Only: Secure connections required

📱 Browser Support

Browser	Support	Features
Chrome 60+	✅ Full	All features
Firefox 55+	✅ Full	All features
Safari 12+	✅ Full	All features
Edge 79+	✅ Full	All features
Mobile Chrome	✅ Full	All features
Mobile Safari	✅ Full	All features

🔧 Advanced Configuration

Custom STUN/TURN Servers

For better connectivity behind NATs, you can configure custom servers:

// src/hooks/usePeer.ts
const customIceServers = [
  { urls: 'stun:your-stun-server.com:19302' },
  {
    urls: 'turn:your-turn-server.com:3478',
    username: 'your-username',
    credential: 'your-password'
  }
];

Free TURN Server Options:

1. Metered.ca - 50GB/month free
2. Twilio - Free tier available
3. Self-hosted COTURN - Free on your VPS

📊 Performance & Limits

Metric	Limit	Notes
File Size	Browser memory	Typically 1-4GB per file
Concurrent Downloads	Unlimited	P2P scales naturally
Transfer Speed	Network limited	Direct P2P connection
Storage Cost	$0	No server storage
Bandwidth Cost	$0	P2P transfer

🤝 Contributing

We welcome contributions! Here's how to help:

1. Fork the repository
2. Create a feature branch
3. Make your changes
4. Test thoroughly
5. Submit a pull request

Development Setup

# Install dependencies
npm install

# Run development server
npm run dev

# Run tests
npm run test

# Build for production
npm run build

📄 License

This project is licensed under the MIT License - see the LICENSE file for details.

🙏 Acknowledgments

• Inspired by FilePizza by Alex Kern & Neeraj Baid
• Built with love for the open-source community
• Uses free STUN servers provided by Google and others

🆘 Support & FAQ

Common Issues

Q: Files not transferring? A: Check if both users have the tab open and active. WebRTC requires active connections.

Q: Connection failed behind corporate firewall? A: Use TURN servers for better NAT traversal.

Q: Large files failing? A: Browser memory limits apply. Try smaller files or enable streaming downloads.

Q: Mobile not working? A: Ensure HTTPS is enabled. WebRTC requires secure contexts.

Need Help?

• 📖 Documentation
• 🐛 Report Issues
• 💬 Discussions

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Made with ❤️ for a free and open internet

Deploy your own instance today and enjoy unlimited, private file sharing forever - completely free!