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Open it up in Preview, then click File and go down to export.

Bunches of options there.
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as vniow said, it is the best and all the equipment and software you need is in the default install. Besides, unless you need to see the mouse, or do a movie, or a timed shot (i.e. for showing menus) then snapx pro iss a bit much. besides it aint free - preview is ...
 
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