Use Terminal: Change the screenshot format to JPG Type or paste the following line into a Terminal window and hit the Return key to execute the command: defaults write com.apple.screencapture type jpg;killall SystemUIServer Change the screenshot format to GIF Type or paste the following line into a Terminal window and hit the Return key to execute the command: defaults write com.apple.screencapture type gif;killall SystemUIServer Change the screenshot format to PDF Type or paste the following line into a Terminal window and hit the Return key to execute the command: defaults write com.apple.screencapture type PDF;killall SystemUIServer Change the screenshot format to PNG Type or paste the following line into a Terminal window and hit the Return key to execute the command: defaults write com.apple.screencapture type png;killall SystemUIServer Change the screenshot format to TIFF Type or paste the following line into a Terminal window and hit the Return key to execute the command: defaults write com.apple.screencapture type tiff;killall SystemUIServer