Mac OS · macOS
Fix an iMovie export or sharing error on Mac
Source-checked About 10 minutes
Answer
Back up the iMovie library and media, restart the Mac, update iMovie, and retry Share > File to a local drive. If export still fails, test a new library and project to isolate the cause.
Back up the library and media
Before troubleshooting, copy the iMovie library and irreplaceable source media to a verified backup.
Restart and update
Restart the Mac, then update iMovie from App Store and install available macOS updates.
Retry a local export
Use Share > File, choose supported settings, and export to a local folder with enough free space.
Isolate the project
Create a short test project with known-good media. If it exports, duplicate the original project and remove recently added media or effects in sections.
Test a new library
Follow Apple's procedure to create a new library and project. Reset or reinstall iMovie only after the backup is confirmed.
Retest the original symptom
A short test and then the full project export to a local writable destination, open, seek, and contain synchronized audio.
Troubleshoot an iMovie export error
If failure repeats at one timecode, source media is missing, a copied project succeeds, or library repair risks the only copy, stop broad resets and return to the last known state. Capture the exact error, versions, device or account scope, and failed step before using the linked official support channel.
Video walkthrough
Sources and verification
Checked against official documentation on . Scope: macOS.
Follow the linked first-party guidance if labels differ after a platform or app update.