Many of my mp3s have ID3 fields that contain spaces at the beginning or at the end of the field. I'm looking for an application that:
- can trim (= remove start and end spaces) every ID3 field of each mp3 in the folder(s) I select
- walk the sub-folders recursively, i.e. not just take the mp3s located at the root of the folder
- has a GUI
- works on Windows, Linux or Mac OS
- is free or non-free