ImageDiet+

ImageDiet+ efficiently converts PNG and JPEG images to the modern HEIC format on macOS. Key Features • Fast batch processing - Convert hundreds of files at once • Parallel processing - Multi-core optimization for speed • Folder & ZIP archive support - Direct selection of compressed files • Preview function - Check quality before conversion • Scientific quality assessment - Automatic adjustment using PSNR & SSIM metrics • Metadata preservation - EXIF and GPS retention • Post-processing - ZIP creation and folder management • Drag & drop support Storage Reduction HEIC conversion achieves 50-80% size reduction while maintaining image quality. Perfect for photo library organization. Supported Formats • Conversion target: PNG, JPEG → HEIC • Preserved formats: WebP, JPEG XL, AVIF (high-efficiency formats kept as-is) Usage Limits • Free version: 250 files per month • Paid version: Unlimited (In-App Purchase) Privacy App Sandbox compliant for secure processing. Only accesses user-selected files.