JXL
– JPEG XLJPEG XL (JXL) is a modern raster image format standardized as ISO/IEC 18181. It supports lossy and lossless compression, high bit depths, wide color gamuts, HDR, transparency and animation. Existing JPEG files can be recompressed to JPEG XL without any loss, saving about 20% of the file size, and converted back to the identical original JPEG.
JXL Converter