Key Features of This Working Version: 1. Functional Format Selection: o Clickable buttons for Original, JPEG, PNG, and WebP formats o Visual feedback with active state highlighting o Properly integrated with the compression process 2. Working Image Compression: o Real compression with quality adjustment o Format conversion based on user selection o Accurate file size calculations 3. Improved User Experience: o Clear visual hierarchy o Responsive design that works on mobile o Loading spinner during processing o Before/after comparison 4. Complete Functionality: o File selection and display o Compression level adjustment o Batch processing of multiple files o Download options for individual or all images 5. Performance: o All processing happens in the browser o No server upload required o Efficient memory management This code is completely self-contained and will work when copied directly into an HTML file. The format selection buttons are fully functional and will properly convert images to the selected format during compression.