Mp3tag is a powerful and yet easy-to-use tool to edit metadata of common audio formats where it supports ID3v1, ID3v2.3, ID3v2.4, iTunes MP4, WMA, Vorbis Comments and APE Tags.

It can rename files based on the tag information, replace characters or words from tags and filenames, import/export tag information, create playlists and more.

Mp3tag supports online freedb database lookups for selected files, allowing you to automatically gather proper tag information for select files or CDs.

Mp3tag supports the following audio formats :

- Advanced Audio Coding (aac)
- Free Lossless Audio Codec (flac)
- Monkey's Audio (ape)
- Mpeg Layer 3 (mp3)
- MPEG-4 (mp4 / m4a / m4b / iTunes compatible)
- Musepack (mpc)
- Ogg Vorbis (ogg)
- OptimFROG (ofr)
- OptimFROG DualStream (ofs)
- Speex (spx)
- Tom's Audio Kompressor (tak)
- True Audio (tta)
- Windows Media Audio (wma)
- WavPack (wv)

Main featues of Mp3tag :

- Batch Tag Editing Write ID3v1.1, ID3v2.3, ID3v2.4, MP4, WMA, APEv2 Tags and Vorbis Comments to multiple files at once.
- Support for Cover Art Download and add album covers to your files and make your library even more shiny.
- Import from Amazon, discogs, freedb, MusicBrainz Save typing and import tags from online databases like Amazon, discogs, freedb, MusicBrainz, and more.
- Replace characters or words Replace strings in tags and filenames (with support for Regular Expressions).
- Create Playlists automatically Create and manage playlists automatically while editing.
- Rename files from tags Rename files based on the tag information and import tags from filenames.
- Export to HTML, RTF, CSV Generate nice reports and lists of your collection based on user-defined templates.
- Full Unicode Support User-interface and tagging are fully Unicode compliant.
- Besides these main features Mp3tag offers a variety of other functions and features ranging ranging from batch export of embedded album covers, over support for iTunes-specific tags like media type or TV Show settings, to combining multiple actions into groups that can be applied with a single mouse click.

Changes in Mp3tag 2.45 :

- FIX: internal selection state was not reset when loading files via drag and drop (since v2.44a).
- LNG: Swedish translation reworked by Matthias Stasiak.
- CHG: removed built-in field mapping from WRITER to COMPOSER at MP4.
- NEW: hex-encoded HTML entities are now also translated in Tag Sources.
- FIX: moving files from one directory to another via drag'n'drop resulted in unresponsive program (since v2.44a).
- FIX: query strings containing equal or ampersand signs did not work with Amazon Tag Source.
- FIX: undo remove or write tag operations sometimes refreshed wrong files in file view (since v2.44a).
- FIX: sorting filtered results displayed files that were not matched by the filter expression.
- CHG: trailing pipe symbol in fields filled by Tag Sources are now removed.
- NEW: installer and program now digitally signed.
- FIX: numerical ID3v2 frames TLEN, TBPM and TDAT were always written in Unicode instead of ISO-8859-1.
- CHG: changed %_total% to be empty if there is no total number of tracks stored in the track field.
- NEW: added support for multiline fields (for e.g., Lyrics) in Tag Panel.
- FIX: lines in M3U playlists consisting of blanks only resulted in the M3U's directory being loaded.
- CHG: multiple values of fields in Tag Panel are now also listed in drop-down fields
- FIX: applying actions on _FILENAME did not always remove invalid characters.
- FIX: tag panel was not updated after removing files from file list (since v2.44a)
- FIX: dropping directories from optical drives was always interpreted as add directory regardless of Ctrl-key state.
- FIX: action Case Conversion (Sentence) and $caps3 gave different results.
- FIX: importing covers via Web Sources occasionally resulted in erroneous mimetype containing charset descriptions.
- NEW: added MATCHES keyword to filter using regular expressions.
- FIX: dropping cover art to extended tag dialog stopped working (since v2.44).
- CHG: empty fields from web source are no longer listed in tag sources dialog.
- FIX: query strings containing question marks did not work with Amazon Tag Source.
- FIX: drag'n'drop of non-audio files resulted in blank line in file view (since v2.44a).
- FIX: selection was not preserved when sorting in file view (since v2.44a).
- FIX: spaces in quoted filter strings were ignored.
- FIX: occasional runtime error on Export (since v2.44a).
- FIX: selection state did not update after filtering (since v2.44a).
- FIX: selecting multiple files via Shift+Arrow keys did not set to fields with different content in Tag Panel (since v2.44a).
- FIX: saving tags when using arrow keys/single mouse click did not work anymore (since v2.44a).
- FIX: selecting multiple files did not set to fields with different content in Tag Panel (since v2.44a).
- FIX: fixed $loop(%field%) still limited after $loop(%field%,n) at export.
- NEW: support for user-defined field name mappings.
- CHG: updated MusicBrainz web source.
- FIX: occasional runtime error when writing tags to malformed FLAC files.
- CHG: improved status reporting when files are added via drag and drop.
- NEW: added *.flc (used for FLAC in some programs) to list of supported file extensions.
- CHG: converter 'Text file - Tag' now runs in separate thread with progress dialog.
- FIX: fixed resizing issue at convert dialogs.
- CHG: addressed performance issues when reading OGG files with large metadata values.
- NEW: filter now supports filter expressions.
- CHG: filtering is now done in separate thread.
- FIX: occasional runtime error when removing tags from Ogg Vorbis files.
- NEW: added support for preserving mp3HD correction data.
- FIX: fixed lost focus after editing via the extended tags dialog.
- FIX: occasional runtime error when canceling writing operations.
- CHG: filter now enabled by default.
- CHG: changed appearance of lists to themed style under Vista and above.
- CHG: removed German help files.
- CHG: removed Quick Launch Shortcut installer option for Windows 7 and above.

Changes in Mp3tag 2.45b beta :

- NEW: Explorer context menu entry now realised via dedicated shell extension.
- NEW: added field PRESENT keyword to filter for files that contain a specfic field in their tags.
- NEW: placeholder %_tool% for TAK now contains used TAK encoder version.
- NEW: support for reordering files via drag and drop at Tag Sources dialog.
- CHG: adjusted MP4 mediatype mappings to reflect changes in iTunes 9.
- CHG: COPYRIGHT field now maps to MP4 cprt atom.
- CHG: extended profile information displayed in %_vbr% for TAK files.
- CHG: file extension is now not selected when renaming files in file list.
- CHG: now displays technical information of the first audio track in MP4 (instead of the first track).
- CHG: SUBTITLE at MP4 now contains what previously was ITUNESPODCASTDESC which now contains the long description.
- CHG: Tag Sources selection dialog now remembers its selection state and sorting of search results.
- CHG: updated discogs web source.
- CHG: updated TAK decoder library tak_deco_lib.dll to TAK 2.0.0.
- CHG: user-defined fields are not truncated to 255 characters in MP4 anymore.
- FIX: menu 'Edit, Select all files' only worked if file list had focus.
- FIX: placeholder %_counter% was not available at action 'Export cover to file'.
- FIX: placeholder %_md5audio% now only available for audio formats tagged with ID3 and/or APE tags.
- FIX: removing files from filter result caused files that do not match the filter expression to be displayed.
- FIX: runtime error when sorting files after filtering with an invalid filter expression.
- FIX: sort indicator in file view was not reset if playlists were loaded or files were added.
- FIX: workaround for MP4 files with unconventional avcC atoms.