Is it safe to delete Core Spotlight index?
The search index for content inside apps, such as mail and notes, that apps add to Spotlight.
Managed by macOS
macOS manages it. It's never moved to the Trash.
~/
What it is
Apps use Core Spotlight to make their own content searchable, and macOS keeps that index in your Library folder, separate from the index of files on your disks. It's usually a few hundred megabytes, but some people have seen it grow to hundreds of gigabytes when indexing goes wrong. macOS creates it again when it's missing.
If it's removed
If the index is removed, searching inside apps such as Mail finds less until macOS rebuilds it.
What to do instead
Leave it to Spotlight, which maintains this index and rebuilds it when needed.
The free analyzer finds it and explains it. The app never removes it.
Sources
- eclecticlight.co/2021/01/28/spotlight-on-search-how-spotlight-works
- discussions.apple.com/thread/255894068
- discussions.apple.com/thread/255661240
Last checked on 26 Sep 2026. Every entry is written and checked by hand; the app and the command-line tool use the same words.