Yes you can easily delete all unused tags using a handy tool and clean-up your WordPress database using Mass Delete Unused Tags plugin.
How To Delete Unused Tags ?
Install and activate Mass Delete Unused Tags plugin then follow the given steps:-
- After activation visit your admin area Dashboard -> Tools -> Delete All Unused Tags page.
- Select the radio button: Yes, delete all unused terms.
- Now click ‘Delete Terms’ button then click ‘Yes’ in confirmation popup
- After successfully delete all tags the plugin will show you the number of tags removed and their ids.