Mac saves all screenshot files to PNG by default. Using of png file format is often too heavy for regular use on the web. Web designers usually prefer lighter JPG. There is an easy way to change the default behavior.
1. Open Terminal
2. Run command
defaults write com.apple.screencapture type jpg; killall SystemUIServerThat’s it! Your screenshots should now save to .jpg file format automatically. This command works for all Mac Os X versions, including Yosemite, El Capitan and Sierra.
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Thomas Samuelsen
Very helpful, thanks