It can rename files based on the tag information, replace characters or words from tags and filenames, import/export tag information, create playlists and more. The program supports online freedb database lookups for selected files, allowing you to automatically gather proper tag information for select files or CDs.

Mp3tag supports the following audio formats:

Advanced Audio Coding (aac)
Free Lossless Audio Codec (flac)
Monkey's Audio (ape)
Mpeg Layer 3 (mp3)
MPEG-4 (mp4 / m4a / m4b / iTunes compatible)
Musepack (mpc)
Ogg Vorbis (ogg)
OptimFROG (ofr)
OptimFROG DualStream (ofs)
Speex (spx)
Tom's Audio Kompressor (tak)
True Audio (tta)
Windows Media Audio (wma)
WavPack (wv)