How to Export only Audio from iMovie?

Here is a step by step guide on how to export only audio from iMovie:

Step 1: Select the clip(s) on the Timeline you would like to export.

Step 2: From the File menu, choose Share.

Step 3: In the box that pops up, select Export using QuickTime. From the pull down menu for Compress Movie for, choose Expert Settings.

export audio from imovie

Step 4: Uncheck the video option in Movie Settings.

export audio from imovie

Step 5: A window will appear.

In the Save As field enter a filename i.e. audioname.aif.
For Where to save your file, choose the Desktop.
From the Export menu, choose Sound to AIFF. Click Save.

export audio

OK! You have done that!

Note: Once you want to make your video collections more playable on your MP4 player or any other handheld device, then you can draw support from MP4 Converter Software for Mac. It rightly provides Mac users an exact solution to convert videos from various formats to MP4 on Mac without any hassle.

Recommend resources:
How to edit your output video file on Mac?
How to add subtitles to a movie with iMovie?