Tags are great. But no matter how meticulous your are with tagging items in digiKam, you'll inevitably end up having multiple unused tags dangling around. Good thing then that the Tag Manager tool makes it easy to remove unused tags. In digiKam, choose Tag > Tag Manager, then choose Mark Unassigned Tags from the Organize drop-down list. This automatically selects all unused tags, and you can delete them by pressing the Delete selected items button.