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Guetzli is a Google program to optimize JPEG images. Unfortunately, it only works one file at a time. With this script in Python you can do it recursively a whole folder.

Image optimized with guetzli-recursively

after and before

Senjuti Kundu

UPDATE GUI for Mac OS

Install

Guetzli must be installed on your system. Follow the official instructions. Guetzli

and 2.7.10 or Python 3.

After

pip3 install guetzli-recursively

Use

guetzli_recursively [folder]

Example

guetzli_recursively img/

out

img/tasks.jpg
Save 6%
img/portfolio/idecrea/space.jpg
It is not necessary to optimize
img/portfolio/home.jpg
Save 3%

Quality

Must be greater than or equal to 84.

guetzli_recursively --quality 85 img/