* Note: If you need to import an MP4 video to iMovie to edit, note that you won’t be able to play the video natively in iMovie though it lets you export video to MP4. Just choose it, and your video will be exported. From options there will be to export the movie file. To export iMovie to MP4, the quick answer is you need to click the icon at the top right corner, which looks like a square with an upwards-pointing arrow. So, below words will teach you how to save iMovie as MP4. Except those situations, iMovie will export video to MP4. Also, when sharing iMovie file through email or uploading to YouTube, Facebook, or Vimeo, it will be exported as MOV format, which will keep the original video quality yet naturally increase the file size.

To be specific, when choosing Best (ProRes) for quality, the iMovie video will be saved as MOV. Exported audio formats: ACC, MP3, AIFF, WAV.Exported video format: MP4 (for low, medium, high and custom quality), MOV (for ProRes quality only).iMovie can export videos as MOV or MP4 by default. How to Solve iMovie Export MP4 not Working?

Convert mp4 to imovie