Where Are Thumbs.db Files Stored?

Short answer: Thumbs.db is not stored in one place. Windows writes a hidden Thumbs.db file inside each folder it has shown as thumbnails — you will find one sitting next to the images in that folder.

Why it is scattered

On network shares and removable drives, Windows caches thumbnails locally in a per-folder Thumbs.db so the folder opens faster next time. On local drives, modern Windows uses a central cache at %LOCALAPPDATA%\Microsoft\Windows\Explorer instead, so you rarely see loose Thumbs.db files there.

How to see them

1. Open the folder with your pictures.
2. Enable Hidden items on the View tab — Thumbs.db is hidden and system.

Stop it being created

Open the Group Policy Editor (gpedit.msc) > User Configuration > Administrative Templates > Windows Components > File Explorer, and enable Turn off the caching of thumbnails in hidden thumbs.db files. This is the standard fix for Thumbs.db cluttering network folders.

Is it safe to delete Thumbs.db?

Yes. Thumbs.db is just a cache of thumbnail images — Windows rebuilds it automatically the next time you open the folder in thumbnail view, so deleting it costs nothing but a moment's slower first load. It is safe to remove from network shares and USB drives too. A genuine Thumbs.db is harmless; only be wary if the name is slightly off (e.g. an .exe disguised as a thumbnail).

See what a Thumbs.db file is, or check whether Thumbs.db can be a virus.