...Guetzli-generated images are typically 20-30% smaller than images of equivalent quality generated by libjpeg. Guetzli generates only sequential (nonprogressive) JPEGs due to faster decompression speeds they offer. Get a copy of the source code, either by cloning this repository, or by downloading an archive and unpacking it. Install libpng. If using your operating system package manager, install development versions of the packages if the distinction exists. Run make and expect the binary to be created in bin/Release/guetzli. Note that Guetzli is designed to work on high quality images. ...