Change filetypes for MacOS screenshots / by Joseph Palumbo

Pressing CMD + SHIFT + 3 or CMD + SHIFT + 4 to use MacOS' native screen capture feature produces high resolution, but bulky, .PNG files. 

Rather than convert each file one-by-one, you can change the default filetype MacOS uses to save these files. 

In terminal, type the following command to switch to .JPG: 

$ defaults write type jpg

Screen Shot 2016-11-30 at 10.59.29 PM.jpg