Возможности:

Запись ID3v1, ID3v2, APEv2, MP4, WMA-тегов и Vorbis-комментариев для нескольких файлов одновременно.
Полная поддержка Unicode.
Поддержка встроенных обложек в альбомы.
Автоматическое создание и составление плей-листов.
Поддержка рекурсивных подпапок.
Сопоставление полей.
Удаление части тега или всего тега из нескольких файлов.
Переименование файлов на основе информации тегов.
Импорт тегов из имен файлов.
Формат тегов и имен файлов.
Замена символов или слов из тегов и имен файлов.
Регулярные выражения.
Экспорт тегов в форматы, которые выберет пользователь (HTML, RTF, CSV, XML).
Импорт тегов из онлайн-баз данных freedb или Amazon.
Импорт тегов из локальной базы данных freedb.
Поддержка ID3v2.3 (ISO-8859-1 и UTF-16) и ID3v2.4 с помощью UTF-8.

Поддерживаемые аудиоформаты:

Advanced Audio Coding (aac)
Apple Lossless Audio Codec (alac)
Audio Interchange File Format (aif / aifc / aiff)
Direct Stream Digital Audio (dsf)
Free Lossless Audio Codec (flac)
Matroska (mka / mkv)
Monkey's Audio (ape)
Mpeg Layer 3 (mp3)
MPEG-4 (mp4 / m4a / m4b / m4v / iTunes)
Musepack (mpc)
Ogg Vorbis (ogg)
IETF Opus (opus)
OptimFROG (ofr / ofs)
Speex (spx)
Tom's Audio Kompressor (tak)
True Audio (tta)
Windows Media Audio (wma)
WavPack (wv)
WAV (wav)

История изменений:

[2019-01-24] REL: VERSION 2.92 (for Windows 10/8.1/8/7/2008/Vista/2003/XP SP3)
[2019-01-18] CHG: removed installer option to pin Mp3tag to taskbar. (#44116, #44117)
[2019-01-17] NEW: added support for silent uninstalls. (#44196)
[2019-01-11] CHG: further compatibility improvements regarding language identifiers when reading and writing ID3v2 USLT frames. (#44167)
[2019-01-11] NEW: added support for MP4 E-AC3.
[2019-01-11] CHG: compatibility improvements for raw AAC that now also supports reading and writing of ID3v2 tags.
[2019-01-11] CHG: compatibility improvements regarding language identifiers when reading and writing ID3v2 USLT frames. (#44167)
[2019-01-10] NEW: added advanced configuration option to toggle listing chapters as separate files (disabled by default). (#19589, #42399, #43935, #44112, #44127)
[2019-01-06] NEW: added support for reading and removing QuickTime chapter information. (#17978)
[2019-01-05] NEW: added information fields %_subsong% (subsong index) and %_subsong_count% (number of subsongs).
[2019-01-05] CHG: import from text file now detects if file is UTF-8 also if it has no BOM. (#14842)
[2019-01-04] FIX: occasional runtime error when pasting metadata.
[2019-01-03] FIX: Tag Panel row calculation for mutliple fields of size Smaller was incorrect in some cases. (#44015)
[2019-01-02] NEW: added Tag-Panel field size Smaller (i.e., smaller than Small). (#42119, #43525, #44015)
[2018-12-31] NEW: added support for MP4 HEVC (hvc1 codec). (#43877)
[2018-12-30] FIX: current selection of files was incorrect after disabling filter in some cases. (#18259, #42896)
[2018-12-29] FIX: enabling and disabling Tag-Panel fields via context menu was limited to 40 fields. (#44012)
[2018-12-28] FIX: enabling and disabling Tag-Panel fields via context menu reverted some customization settings. (#44012)
[2018-12-22] NEW: added %_video_width% and %_video_height% for Matroska video files. (#43969)
[2018-12-21] FIX: empty album artwork placeholder image was blurry on high DPI screens. (#43899)
[2018-12-21] FIX: action to import text file did not apply new field content if first value was identical. (#16091)
[2018-12-19] LNG: updated Bulgarian, Czech, French and Slovak language files.
[2018-12-18] FIX: global placeholders were parsed incorrectly when used inside scripting functions at export. (#12378)
[2018-12-17] FIX: loading files from drive root directory did not work anymore (since v2.91a). (#43902)
[2018-12-16] NEW: added support for MP4 HEVC (hev1 codec). (#43877)
[2018-12-10] CHG: added even more mappings for special MusicBrainz fields for ID3v2 and MP4. (#43846)
[2018-12-10] FIX: parsing error for export filenames that contained escaped parentheses. (#43826)
[2018-12-10] FIX: files from recycle bin were displayed when loading drive root directory. (#17833)
[2018-12-09] NEW: added option to configure size of multiline tag fields. (#15943)
[2018-12-08] CHG: enabling mouse wheel in dropdown fields after edit by opening the list (besides pressing keys arrow up or arrow down). (#16423, #43754)
[2018-12-07] FIX: editing of cuesheets was no longer possible (since v2.90c). (#43809)
[2018-12-04] FIX: auto-complete for Tag-Panel fields was case sensitive (since v2.90e). (#43743)
Полная история версий

О Portable версии:

Портативная версия от разработчика, работает без установки в систему и запускается из любого носителя информации.
Распаковывается из установщика.