Audio Tagging & Library Management

Tagging tools fix metadata (artist, album, title, year, genre, cover art) on your local audio files; library managers go further by reorganizing files into a coherent folder structure and building a queryable database. Useful before pushing into a self-hosted music server like Navidrome or Plex Music — see selfhost-photos-media for those. For audio editors see audio-editors.

Tag editors (manual)

• ★ MusicBrainz Picard — GPL, cross-platform. The reference free tagger. Uses AcoustID audio fingerprinting + MusicBrainz database to auto-identify tracks even with broken filenames. Plugins for ReplayGain, cover art (Cover Art Archive), genre voting. The default in 2026.
• ★ Mp3tag — free Win (paid Mac/Linux ~$20); fast manual tag editor + scripting + multi-source online lookups. Win freebie that's been the standard for 20 years. Paid Mac/Linux versions came in 2022.
• Kid3 — GPL cross-platform tag editor.
• TagScanner — free Win.
• EasyTag — GPL Linux GTK tagger.
• Metatogger — free Win freemium.
• Yate — paid Mac; powerful scripting.

Library managers (auto-organize)

• ★ Beets — MIT, Python CLI + plugins. The library-manager-as-pipeline; auto-tags via MusicBrainz, renames into your scheme, dedups, ReplayGain, lyrics, lastfm-import, BPM detection — dozens of plugins. The default for serious music collections.
• MusicBee — free Win; full library manager + player + tagger.
• MediaMonkey — freemium Win / Android.
• Swinsian — paid Mac; minimal-but-fast iTunes-style.
• Nicotine+ — GPL Soulseek client, also has tag editing (incidental).

Music servers (link into your library)

See selfhost-photos-media for full coverage:

• Navidrome — Subsonic-API music server.
• Plex Music — closed source.
• Funkwhale — federated.
• Roon — paid audiophile-leaning.
• Lyrion Music Server (formerly Logitech Media Server) — Squeezebox ecosystem.

ReplayGain / loudness

• ★ Loudgain — GPL CLI; ReplayGain 2.0 (EBU R128). The modern way to write RG tags.
• rsgain — newer GPL CLI; even faster.
• mp3gain / aacgain — legacy lossless tag-only RG taggers.
• Picard ReplayGain plugin — built into Picard.
• Beets replaygain plugin — built into Beets pipeline.

Cover art

• Cover Art Archive (MusicBrainz) — open archive of covers; Picard auto-fetches.
• fanart.tv — free metadata + art for movies / TV / music.
• Beets fetchart plugin — automated.

Audio fingerprinting / identification

• AcoustID — open audio fingerprint database; powers Picard and many others.
• Chromaprint — LGPL fingerprinting library.
• Shazam / SoundHound — closed mobile apps.

Format conversion / batch

• dBpoweramp — paid Win / Mac; batch conversion + accurate ripping.
• Exact Audio Copy (EAC) — free Win; the bit-perfect CD ripper.
• fre:ac — GPL cross-platform converter.
• XLD (X Lossless Decoder) — free Mac; the Mac equivalent of EAC.
• ffmpeg — see audio-editors; universal converter.
• flac / opus-tools / lame — codec CLIs.

Audiobook / podcast metadata

• m4b-tool — GPL; build / split .m4b audiobooks.
• Audiobookshelf — see selfhost-photos-media.

Pick this if…

• Auto-identify mistagged music: Picard.
• Manual tag fixing, fast UI on Win: Mp3tag.
• Pipeline-style library auto-organize: Beets.
• Win all-in-one library + player: MusicBee.
• Bit-perfect CD rip: EAC (Win) or XLD (Mac).
• ReplayGain: Loudgain or rsgain (or built into Beets / Picard).