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: Right-click the generated QR code image to save it
• 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. Right-click the generated QR code image and select "Save image as..." to download

• 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.