MozJPEG reduces file sizes of JPEG images while retaining quality and compatibility with the vast majority of the world's deployed decoders.

Features • Progressive encoding with "jpegrescan" optimization. It can be applied to any JPEG file (with jpegtran) to losslessly reduce file size. • Trellis quantization. When converting other formats to JPEG it maximizes quality/filesize ratio. • Comes with new quantization table presets, e.g. tuned for high-resolution displays. • Fully compatible with all web browsers. • Can be seamlessly integrated into any program using libjpeg.