Maximum iMovie Library file size

Hi,

As others have said on this thread, there is no specific size limit for an iMovie library. However, if they get too large, like say 250 GB, they can start acting sluggishly and take more time to load. I create a new iMovie library every year and keep them under 30 GB in size, like this:

-- Rich

I don't think there is any limit but it would be wise to create new libraries rather than letting one get too big . . . all your eggs in one basket?

See this AI generated response covering the advantages of using multiple libraries:-

Yes, you can have multiple iMovie libraries on your Mac. 

Multiple libraries allow you to organize your projects and clips more efficiently. You can create additional libraries to:

• Archive older projects
• Free up storage space by moving events to external drives
• Work on a project on a different Mac
• Avoid performance issues caused by large libraries with many projects 

To create a new library in iMovie:

1. In the iMovie app, go to File > Open Library > New. 
2. Name your new library and choose a location (e.g., an external drive or a specific folder).
3. Click Save. A new, empty library is created with a new event. 

You can have multiple libraries open at once. To switch between them:

• Use the Library dropdown menu in the top-center of the iMovie window. 
• Or, go to File > Open Library and choose from recently opened libraries, locate a library, or create a new one. 

You can also move projects, events, or clips between libraries using drag-and-drop (move) or Option-drag (copy). 

 This lets you reorganize your workflow while keeping projects self-contained and easy to back up or share. 

I suggest that creating a unique (individual) iMovie Library for each Project is the best way to manage your media and projects. It minimizes Library size and is also a clean collection of the media associated with each project.

An iMovie Library where you continue to import more & more media & create more & more projects becomes increasingly complex for management of the Library as well as becoming increasingly risky for the retention & backup of all your media.