Mp3tag is a powerful and easy-to-use tool to edit metadata of audio files. It supports batch tag-editing of ID3v1, ID3v2. 3, ID3v2. 4, iTunes MP4, WMA, Vorbis Comments and APE Tags for multiple files at once.
To add tags to or edit or delete tags of multiple resources at once, use Tag Editor. With Tag Mp3 Editor, you search for the resources that you want to tag, and then manage tags for the resources in your search results. MP3tag is only for tagging. But once you have converted the file, you can copy the tags from the MP4 file(s) to the MP3 files, possibly in one go for several files.