TK Music Tag Editor is an Android app developed by TK2013 that lets you edit the metadata of music files in mp3, m4a, flac, and wma formats. The app writes the tags directly to the music files, making them available even when you use them on a different device or PC. You can edit and customize the title, artist, album, cover art, lyrics, and more. The app also allows you to create playlists and change filenames while editing.

The app supports m4a, flac, and wma formats and also detects mp3 files with m4a formats, with the ability to change the extension to .m4a. You can search for music files in an explorer-style display, and multiple files can be edited in bulk. The app is free to use and user-friendly.