Guetzli : A New JPEG Encoder For Higher Compression

Google’s new algorithm promises to reduce the size of JPEG images by 35% without losing quality
Guetzli uses the JPEG format. So, softwares which can currently read standard JPEGs will also be able to read Guetzli JPEGs without any other modification. Guetzli Is A New JPEG Encoder For Higher Compression Developed By Google. Released free software generates ~35% smaller images than libjpeg. We are not going in to in depth technical details about the technology as readers can read the official Google blog with visual examples :

Guetzli is an algorithm very similar to Zopfli, which is another project also developed by Mountain View but for the compression of PNG and gzip file format.

Guetzli uses a large amount of memory, around 300MB of memory per 1 megapixel of the input image and a significant amount of CPU time – about 1 minute of CPU per 1 megapixel of input image.

Guetzli : A New JPEG Encoder For Higher Compression

As developer, you will be interested to check the Github project and try :

On Mac, unless you want the build by hand, with Homebrew you can easily install by running the command :

which will return this output :

Example command to convert image is :

There is no manual entry for guetzli. As example, I ran :

which returned this output :

Processed image nicely opened in Mac Preview.