By default, Mac OS X saves all screenshots as PNG or portable network graphics format. While this a perfectly good format. In fact, a very good one, there is always the possibility that a PNG may not open on some computers. So rather than converting it each time, why not simply change the default format of screenshots ? Open Terminal ( Applications --> Utilities --> Terminal ) and type in the following -
defaults write com.apple.screencapture type JPG
Then press enter and type -
Killall SystemUIServer
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