Guetzli

Guetzli: Open Source JPEG Encoder

Guetzli is an open source JPEG encoder created by Google. It is designed to produce JPEG images with file sizes 20-30% smaller than other encoders while maintaining the same visual quality.

What is Guetzli?

Guetzli is an open source JPEG encoder created and released by Google in 2017. Its main goal is to create JPEG images that have file sizes 20-30% smaller than images of equivalent quality produced by other JPEG encoders, without losing visual quality.

It achieves the improved compression by spending more time optimizing the images. Guetzli will take multiple minutes to encode an image, while other encoders typically take milliseconds. But this additional computational time allows it to minimize visual artifacts through more comprehensive optimization.

Guetzli works best on high quality source images such as those produced by digital cameras. It is not designed to replace baseline JPEG as a general web image format, but can produce dramatically smaller image file sizes in cases where quality is the top priority.

Since its launch, Guetzli has seen adoption by some high profile websites looking to improve image compression. It's also freely available on GitHub, allowing anyone to utilize it or build upon the open source code.

Guetzli Features

Official Links