What is com.apple.quicklook.thumbnail.OfficeExtension on Mac?
Office Quick Look thumbnails · seed · quit hint: usually safe
com.apple.quicklook.thumbnail.OfficeExtension is a macOS process (listed here as Office Quick Look thumbnails). People usually find it in Activity Monitor when asking “what is this process?”
What does com.apple.quicklook.thumbnail.OfficeExtension do?
OfficeThumbnailExtension is Apple’s Quick Look Thumbnailing extension for Office-style document types. Finder and other clients start it on demand so those files show content previews instead of generic icons. Quitting cancels in-flight thumbnail generation until the next request; leave it alone while browsing document folders.
When to leave com.apple.quicklook.thumbnail.OfficeExtension running
- browsing-documents-in-finder
Is it safe to quit com.apple.quicklook.thumbnail.OfficeExtension?
Hint: usually safe. SystemWoe Free and Pro use keep-guards so you don’t blindly kill something important — Pro adds force-terminate only with confirmation.
Further reading
- https://developer.apple.com/documentation/quicklookthumbnailing
- https://developer.apple.com/documentation/quicklookthumbnailing/providing-thumbnails-of-your-custom-file-types
Related system processes on Mac
- What is AccessibilityUIServer on Mac? · Accessibility UI Server
- What is com.apple.appkit.xpc.ThemeWidgetControlViewService on Mac? · AppKit theme widget view service
- What is com.apple.systempreferences.AppleIDSettings on Mac? · Apple Account Settings
- What is AquaAppearanceHelper on Mac? · Aqua Appearance Helper
- What is AudioConverterHardenedService on Mac? · Hardened Audio Converter service
- What is com.apple.quicklook.thumbnail.AudiovisualExtension on Mac? · Audiovisual Quick Look thumbnails