Compress a project in GarageBand on Mac

You can copy your projects to a hard drive or other storage device, or upload them to the internet to share them with other GarageBand users.

GarageBand saves projects in a package (with a .band file extension) that contains all the files for the GarageBand project. It’s compatible with Apple services and storage devices formatted for Apple operating systems. To ensure that your project package opens correctly on a non-Apple device or internet service, you must compress the GarageBand project package before copying or uploading it.

Select the package in the Finder and choose File > Compress (or Control-click the file and choose Compress).
Note: If you’re using compression software from a developer other than Apple, refer to its user guide for instructions.

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GarageBand User Guide

Compress a project in GarageBand on Mac