**Install jpegoptim** \\
sudo apt-get install jpegoptim


**How to compress a file**\\
jpegoptim filename.jpeg


**To compress above the image from 5.6MB to around 500k.**\\
$ jpegoptim --size=500k filename.jpeg

**Compress all images at once.**\\
jpegoptim *.JPG



Optimize PNG

<code>sudo apt install </code>

To optimize a PNG file, run

<code>$ optipng -o7 file.png</code>

-o selects the optimization level. The higher the level, the more compression trials. OptiPNG optimizes the given file in-place.

To make the file further smaller, we can remove the metadata from the PNG file by specifying --strip all:

<code>$ optipng --strip all -o7 file.png</code>