MPEG-2 became the standard video format for DVD and SD digital television. The format is supported by both Windows and Mac OS. Open the Video tab at the bottom of the window. Its fully compatible with iPad and iPhone too so you can send your video to those devices.Īfter all settings are done tap on the Compress button to compress MP4 video size for free after a few seconds. To make a video smaller with QuickTime open the app from your Applications folder and click File. MP4 files can come with a number of different formatting options to help compress video. Meanwhile You can try Wondershare UniConverter to have more powerful compression features.