Step 3: The secret to change lies in this window. This will also inform you about the length of your video and estimated file size. The information cum options are Description of the video, Tags, Format, Resolution, Quality, and compress. This will have 6 information and options combined. This small window will have all the specifications of the output of the video project. Step 2: When you click the file option, it will open a small pop up window. Share option will open another small menu attached to it which gives you an option where you want to share. By clicking on that will drop a menu where you will find the share option. In the main page at the right corner upper end near the iMovie logo, you will get the 'File' tab. Step 1: The way you share your file normally, follow those initial steps normally. This is a step by step guide to setting your iMovie to get your project in Mp4 format. This feature is not popular and has been hidden. There are a few settings that you can change in the output to save your videos in MP4. IMovie with default settings saves projects with MOV format. Use iMovie Alternative Editor to Save Video as Mp4

Save imovie as mp4