taglib

TagLib is an open-source, cross-platform C++ library for reading and editing metadata in audio and other media files. The library provides a uniform API to access common tag types and artwork across several formats, enabling applications to read, modify, or write metadata without dealing with the specifics of each format.

Supported formats include ID3 (v1 and v2) in MP3 files; MP4/M4A (iTunes-style tags); FLAC and Vorbis (including Ogg Vorbis and Ogg FLAC); WMA/ASF; WAV and AIFF; and APE. TagLib exposes tag data such as title, artist, album, track number, year, genre, comments, lyrics, as well as embedded pictures.

When integrated into software, TagLib is used by media players, organizers, tag editors, and conversion tools to ensure consistent metadata handling across formats. The library is designed for C++ projects but has bindings and wrappers in other languages through third-party projects.

TagLib is released under the GNU Lesser General Public License (LGPL) version 2.1 or later, and runs on major platforms including Windows, macOS, and Linux.

Typical usage involves creating a File object for a path, retrieving its Tag interface, reading or setting fields, and saving changes back to disk.

Development and documentation are available via the project's website and source repositories.