A simple web application that generates QR codes from URLs and allows users to download them as PNG images.

• URL Input: Enter any valid URL to generate a QR code
• Customizable Size: Choose from multiple size options (200x200 to 1000x1000 pixels)
• Instant Generation: QR codes are generated in real-time using the qrcode library
• PNG Download: Download the generated QR code as a PNG file
• Responsive Design: Clean, mobile-friendly interface using TailwindCSS
• Input Validation: Ensures valid URLs are entered before generation

1. Enter a valid URL in the text field (e.g., https://example.com)
2. Select your desired QR code size from the dropdown
3. Click "Generate QR Code" or press Enter
4. Once generated, click "Download PNG" to save the QR code to your device

• Frontend: Pure HTML/CSS/JavaScript with TailwindCSS for styling
• QR Generation: Uses the qrcode library from ESM.sh
• Canvas Rendering: QR codes are rendered to HTML5 canvas for high quality
• Client-side Only: No backend required, all processing happens in the browser

├── index.ts           # HTTP handler that serves the QR code generator webpage
└── README.md          # This documentation file

The application is entirely self-contained in a single TypeScript file that serves the HTML content.