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XL Converter is a free, open-source image conversion application for Windows and Linux that specializes in modern compression formats. It supports JPEG XL, AVIF, WebP, JPEG, and PNG for efficient image storage. Its parallel encoding engine processes multiple images simultaneously to improve conversion speed. JPEGLI encoding produces standard-compatible JPEG images with improved compression efficiency. Lossless JPEG transcoding can reduce existing JPEG file sizes without degrading image quality. Users can resize images by resolution, percentage, longest or shortest side, or megapixel count. The application integrates specialized image processing libraries and ExifTool for metadata-related operations. XL Converter provides a graphical interface for optimizing individual images and large collections.
Features
- Image conversion supporting JPEG XL, AVIF, WebP, JPEG, and PNG formats
- Parallel image encoding for faster processing of large image collections
- JPEGLI JPEG compression with improved efficiency and standard format compatibility
- Reversible lossless JPEG transcoding for reducing file sizes without quality degradation
- Flexible image resizing by resolution, percentage, image dimensions, or megapixels
- ExifTool integration and configurable encoding workflows for modern image optimization
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