Mp3tag

Mp3tag is a tag‑editing application for macOS that lets users modify metadata and cover art for a wide range of audio and video file formats, including MP3, MP4, FLAC, WAV, M4V, MKV, OGG, OPUS, AIF, DSF, MPC and WV. It supports batch operations, allowing many files to be edited simultaneously, and can rename files based on tag information. Users can also replace characters or words in tags and filenames, import tag data, and adjust the size and format of embedded cover images.

The program integrates online database lookups from Discogs and MusicBrainz, enabling automatic retrieval of accurate tags and album artwork. It also provides action groups that combine repetitive tasks—such as field formatting, case conversion, removal of unwanted tags, or cover‑art resizing—into reusable workflows.

Targeted at musicians, DJs, podcasters and audio‑enthusiasts who manage digital libraries, Mp3tag offers a unified interface for handling both audio and video metadata, streamlining catalog organization and consistency across large collections.