How to Convert Videos on a Mac with No Additional Software
If you have any video s on your Mac that are particularly large in file size, then putting them on your iPad or iPhone can easily devour tons of space. You can convert videos on your Mac, however, using no additional software.
Just open up a video in QuickTime, then select File > Export. From here, you can export a video to a variety of formats.
Source: How to Convert Videos on a Mac with No Additional Software
