The short answer
Yes. Rebuilt or re-downloaded automatically when needed.
What is it?
Every Unity project has a Library folder next to its Assets and ProjectSettings folders. It is Unity’s cache of imported assets, compiled scripts, shader caches and package data, and it is not meant for version control. Only folders in projects untouched for 30 days are considered. It often reaches several GB.
Imported assets cache. Unity rebuilds it when the project is opened (can take a while).
What happens if you delete it?
Unity re-imports all assets and rebuilds the folder the next time the project is opened, which can take from a few minutes to hours for large projects. Your assets and scenes are not affected.
How to remove it properly
Close the project in Unity, then move its Library folder to the Trash in Finder.
Quit the app that uses it, then move it to the Trash. Empty the Trash when you’re sure.
- MoreRoom only suggests items unused for 30 days or more.
Before you delete it
A few editor preferences, such as the last opened scene and window layout for that project, may reset.
How MoreRoom helps
MoreRoom recognises this item, shows its real size and when it was last used, and labels it “Safe to remove”. In the free version you can move it to the Trash in one click, with Undo; Pro collects every safe item at once.
Frequently asked questions
Is it safe to delete the Library folder in a Unity project?
Yes. Rebuilt or re-downloaded automatically when needed. Unity re-imports all assets and rebuilds the folder the next time the project is opened, which can take from a few minutes to hours for large projects. Your assets and scenes are not affected.
Will Unity project Library folders come back after I delete it?
Yes. Unity re-imports all assets and rebuilds the folder the next time the project is opened, which can take from a few minutes to hours for large projects. Your assets and scenes are not affected.
How do I remove Unity project Library folders properly?
Close the project in Unity, then move its Library folder to the Trash in Finder.