Kid3 allows adding information such as artist name, song title or album to multimedia files.
This information, usually known as tags, can be added to many files at once, as in the case of a complete music album, where all the files usually share the same values in the Artist and Album fields.
|350px|thumb||Kid3 upon starting|
Kid3 can edit the tags of the following file types: MP3, Ogg/Vorbis, FLAC, MPC, MP4/AAC, MP2, Speex, TrueAudio, WavPack, WMA, WAV and AIFF.
ID3v1.1, ID3v2.3 and ID3v2.4 tags are supported.
|350px|thumb||Kid3 window while tagging a file|
Kid3 can also set tags automatically based on the file names, or rename files based on their tags.