Tutorial: How to permanently reduce screenshot file size on Mac OS X computers in 60 seconds. Terminal command (copy and paste this):
defaults write com.apple.screencapture type jpg
This video shows you how to use a single terminal command on your mac computer to greatly reduce the file size of your screenshots. The method changes the file format to something that uses a small degree of file compression to produce a file that has nearly identical image quality, while being as much as 80% smaller in size. In the example shown, the same screenshot goes from 1.4 megabytes to 0.25 megabytes.
The video may be a little bit longer than 60 seconds, but everything you need to hear happens before the last few "thanks for watching" moments. You can also skip the entire video and just copy/paste the command into the terminal to see for yourself.
I didn't show this in the video, but if you prefer, you can also change the file type to pdf, in case that format better suits your needs for whatever reason.
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