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Google’s ‘Guetzli’ Image Encoder Offers 35% File Size Saving over Traditional JPEG Compression

Guetzli uses Google's new Butteraugli model to compress JPEG images in a way that offers either smaller or higher quality images. Though the encoding process takes longer, the search giant believes the payoff will be worth it.


has made several attempts and image compression over the years, from its WebP format to its VP8 predecessor. However, all of these have had one major problem: compatibility. The formats aren't supported across the board, instead found primarily in the chrome browser.

Alphabet Inc.'s latest project doesn't have such limitations. ‘Guetzli' is a new image encoder out from Google Research's office in Zurich, translating to ‘cookie' in English. The encoder offers image compression for smaller or better-looking images. Even better,

Even better, it's open source.Developers can view the Guetzli code on Github and integrate it into their own projects. If it takes off, we could see image processing apps ditching the current jpeglib encoder and moving to Google's method.

How it Works

Though there are plenty of different methods for compression, Guetzli has a particular focus on quantization. It takes disordered data and orders it, making it much easier to compress. However, in most methods this results in a loss of quality, resulting in blocky images instead of smooth ones.

As each image has different requirements, it's hard to create an encoder with a minimal visual impact that also reduces file size sufficiently. As a result, Google's research team created a new model called ‘Butteraugli'.

Guetzli cats eye google
Uncompressed image | libjpeg compressed | Guetzli

According to the team, the Butteraugli model is based on the way humans perceive the world. It can apparently guess color perception and other factors in a more nuanced way:


“Guetzli strikes a balance between minimal loss and file size by employing a search algorithm that tries to overcome the difference between the psychovisual modeling of JPEG's format, and Guetzli's psychovisual model, which approximates color perception and visual masking in a more thorough and detailed way than what is achievable by simpler color transforms and the discrete cosine transform,” said the team.

Of course, such functionality comes at a price, and in this case, it takes “significantly longer” to compress images. However, for the websites of photographers and graphic designers, the payoff will likely be worth it.

You can download Guetzli today from GitHub.

Ryan Maskell
Ryan Maskellhttps://ryanmaskell.co.uk
Ryan has had a passion for gaming and technology since early childhood. Fusing the skills from his Creative Writing and Publishing degree with profound technical knowledge, he enjoys covering news about Microsoft. As an avid writer, he is also working on his debut novel.

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