guetzli: guetzli (Perceptual JPEG encoder) guetzli: guetzli: Guetzli is a JPEG encoder that aims for excellent compression density guetzli: at high visual quality. Guetzli-generated images are typically 20-30% guetzli: smaller than images of equivalent quality generated by libjpeg. guetzli. Guetzli generates only sequential (nonprogressive) JPEGs due to guetzli: faster decompression speeds they offer. guetzli: guetzli: guetzli: guetzli: