Release Notes
Here, I describe new features and noteworthy changes. Please see the Changelog for a complete list.
Mp3tag v3.34
2026-04-10
Modern Icons
I’ve updated the toolbar and menu icons with a more modern look. They’re now sharper, scale better across different resolutions, and are easier to read, especially in dark mode, where they use more vibrant colors.
From early beta feedback, I know that (like with any visual change) some people immediately enjoy the new look, while others prefer what they’re used to.
If you give the new icons a try and decide they’re not for you, you can switch back to the Original set via File → Options → Appearance → Icons. I’ve also redrawn those so it looks crisp at larger sizes and when scaling is enabled.
User Interface Scaling
Requests for larger fonts and better readability have been around for a long time. Until now, I usually pointed to the Windows DPI settings, but those often come with trade-offs in other apps.
With this release, you can now scale Mp3tag’s interface from 100% to 200% in 10% increments.
So if you ever found yourself squinting your eyes while managing your music library, check if you need to adjust your system’s display settings or use this new option at File → Options → Appearance → User Interface Scaling.
Toolbar Configuration
This version also introduces a customizable toolbar.
You can rearrange buttons, choose different symbols, add commands that were previously only available via the menu, include external tools, run actions and action groups directly, or trigger specific tag sources with a single click.
It’s available via right click on the toolbar or View → Toolbars → Customize main toolbar.... Here, you also find an option to customize the newly introduced Custom Toolbar, a second toolbar for even more flexibility.
Bugfixes and Internal Changes
As always, this new version also includes bug fixes and many other improvements. For example, an option to write an UTF-8 BOM for m3u8 playlists at File → Options → Playlist.
Mp3tag v3.33.1
2026-02-06
Bugfixes and Minor Changes
This minor version includes bug fixes and other improvements that have been reported since the last release. Most notably, it reverts back to the previous behaviour where it doesn’t try to preserve umodified ID3v2 frames and MP4 atoms. When saving, Mp3tag now writes tags according to its documented internal mappings by default.
If someone prefers minimal changes applied to the tag, I’ve added the configuration options Reuse unmodified ID3v2 frames and Reuse unmodified MP4 atoms at Options → Tags → Advanced. If those options are enabled, existing user-defined fields for which a mapping exists are not remapped to the target representation unless the field value changes. As a result, mapped fields are only rewritten when their corresponding field contents are modified.
Mp3tag v3.33
2026-01-22
Adjust Covers to Square, Crop to Square, and new resizing options
This new version comes with various improvements and new functions for adjusting cover art. Next to proportional scaling, it’s now possible to scale to square, and even crop to square when adjusting album covers. Resizing can now be skipped entirely, allowing image-format changes while keeping the original cover size. Resizing used a maximum size setting before, where the image was only resized if its dimensions exceeded a certain threshold. Now, with the minimum size setting, a fixed target size can be configured.
Mitigation for issue introduced by recent Windows Update
I also had a lot of fun with a recent Windows Update, which broke some basic functionality (extending a file in size) if the file was synced via OneDrive or another cloud-storage provider like Dropbox. This was mainly noticeable when adding cover art, because those modifications usually use up all reserved padding in the files and, well, extend the file size. So if you noticed any flakiness in adding cover art, it’s thanks to a recent Windows Update that dropped in January.
Versioning Scheme Changes
I’ve also changed the versioning scheme I’m using for Mp3tag. While this version doesn’t look different from the ones before, the new scheme now allows for bugfix releases independent from beta versions. I changed this in the hope of being more flexible in reacting to issues like the one mentioned above. Let’s see how long it takes for a version v3.33.1 to be released.
Bugfixes and Internal Changes
As usual, this new version also includes bug fixes and many other improvements, including changes to ID3v2 writing, where unmodified fields now preserve the original ID3v2 frames stored in the file.
Mp3tag v3.32
2025-11-14
Select Similar Files and Select Next Similar Files
I originally designed this function to select files belonging to the same album, but realised it could be expanded to support other fields as well. The new feature, available via Edit → Select similar files, allows you to select files similar to the currently selected one based on the active sort criteria.
For example, if your File List is sorted by Album Name and you want to quickly select all files from the current album, simply choose this menu item or use the keyboard shortcut Ctrl+G for faster access.
You can also select the next group of similar files, those that differ from the currently selected file according to the active sort criteria, via Edit → Select next similar files or the shortcut Ctrl+Shift+G.
Auto-Completion of Custom List Values
Just a quick recap: Custom List Values can be configured per field and are always available as entries in the Tag Panel’s drop-down lists. This helps maintain consistency, for example, by defining a list of composer names, countries, or languages.
What’s new is that these values are now also available for auto-completion when editing in the File List or in the Extended Tags dialog. And this also applies for the Genre field!
Importing Composer and Mix Artist from Discogs
The Discogs Tag Sources are now importing the COMPOSER from the extra artist roles Composed-By, Music-By, Songwriter, and Written-By and variants thereof. The extra artist role Remix is used to import MIXARTIST.
Bugfixes and Internal Changes
As usual, this new version also fixes bugs and comes with various other changes and improvements. So I recommend everyone to update — especially if something doesn’t work as expected.
Mp3tag v3.31a
2025-08-18
Fixed Regressions
That was quick! v3.31 introduced some issues from one of the intermediate beta versions, and I’ve fixed them in this release before they spread further. As always, you can find the details in the Changelog.
Mp3tag v3.31
2025-08-15
Cover Management
The new feature Manage covers… from the cover menu opens a dialog for adding, removing, replacing, adjusting, and reordering of embedded cover art in one or multiple files. It’s very powerful and I’m happy how it turned out. For example, it’s now possible to select a cover that’s present in a single file to be embedded in all selected files. There is also a new keyboard shortcut Ctrl+Alt+M for quick access.
Selective Removal of MP3 Tag Types
The Utils context menu in Mp3tag’s File List now has a dedicated entry for removing MP3 tag types ID3v1, ID3v2, and APEv2 individually. The same menu now also has a menu item for removing unsupported fields from MP3 files.
Bugfixes and Internal Changes
This new version also includes a surprising amount of fixed bugs and internal changes. So I recommend everyone to update — especially if something doesn’t work as expected.
Mp3tag v3.30
2025-05-29
Improvements for Multiple Files with Varying Covers
So far, adding a cover to multiple files with varying covers was only possible via a dedicated action and not directly via drag and drop or the right-click context menu on the Tag Panel. This release adds support for adding covers to files with varying covers (also via drag and drop if the Ctrl key is pressed) at Tag Panel and Extended Tags. It also improves the cover menu labels to indicate which functions are applied to all covers if multiple files with varying covers are selected.
Field mapping for Matroska MKV video files
The previous version introduced improved internal field mappings for MKV video files, which were not compatible with every app. This release adds an option to disable video-specific mappings for Matroska video to increase compatibility with apps that only read TITLE with target type T=30 (see Options → Tags → Advanced).
ARM64 Explorer Context-Menu Extension
Explorer context-menu extensions have the requirement to be made available in the architecture of the host system, i.e., 32-bit, 64-bit, or ARM64 for ARM-based systems. This version adds an ARM64 context-menu extension which shows the Mp3tag menu item on ARM-based Windows installations.
Mp3tag v3.29
2025-03-28
Field mapping for Matroska MKV video files
The Matroska file format features a complex metadata structure based on target types. These define different levels at which the same tag field can be applied. For example, PART_NUMBER can be the track number (level 30) and the disc number (level 50). To improve compatibility with other apps and to match semantics, I’ve improved the internal mappings for MKV video files with this release.
Scripting function to sort field contents
When multiple values (e.g., genres, styles, or composers) are stored in a single tag field, sorting them can make similarities more visible — and simply bring some order :) The new scripting function $sort(x,y) sorts segments of a string based on a specified delimiter. It’s for example possible to create an action that appends a certain value to existing content and have the combined values sorted automatically. It’s quite handy (though not for everyone).
Installer niceties
The installer of this new version now automatically attempts to close a running instance of Mp3tag before trying to update. Also, it has an option to run Mp3tag directly from the installer when installation is finished. As a nice extra, the uninstaller is now also code-signed.
Mp3tag v3.28
2024-11-15
Large Toolbar Icons
Depending on the screen resolution, the Windows DPI settings, and/or the individual strength of eyesight, the toolbar icons could be perceived as too small and as difficult to identify and distinguish. I’ve added support for scaling toolbar icons up to 200%. You can find the new configuration setting at File → Options → Appearance.
Replace Cover
If you want to replace the existing embedded album cover, it involved a couple of steps (removing old, and selecting new). If the file had multiple covers and you wanted to replace a cover, even more steps were involved: in addition, the existing covers needed to be exported and re-added. This is a thing of the past, and the currently displayed cover can now easily be replaced via the Edit → Cover → Replace Cover function (also available via the right-click contextual menu on the cover window).
Mp3tag v3.27a
2024-08-21
Hotfix for MP4 tagging
That was quick! v3.27 had some issues wrt. MP4 tagging where fields iTunNORM and iTunSMPB were removed on tag update. I’ve decided to pull a hotfix release to make sure that as many people as possible are using the fixed version.
Mp3tag v3.27
2024-08-08
Searching the File List
I’ve added support for searching the File List via Edit → Find… and Ctrl+F. Till now, it was always possible to Filter the File List, i.e., reducing the list of files based on simple or complex criteria. However, sometimes it’s also helpful to see which fields are affected or to inspect the matching files in context of the unmatched files. This is where the new Find feature comes into play. It opens a dedicated search window, lists the matching files (you also sort the list, e.g., by field!), and provides means of selecting and navigating the File List based on those matches.
Cover Dimensions for Discogs Query Results
This new column for Discogs Query Results is for everyone who prefers square cover art.
Improvements for MP4 support
This version adds support for Opus in MP4 containers, introduces new MP4-specific field mappings, adds support for detection of AV1 video tracks in MP4, and adds error reporting for malformed MP4 files.
Re-Implemented TAK support
I got rid of the official TAK library tak_deco_lib.dll, which was only available as external DLL and re-implemented Mp3tag’s support for TAK with my own parser. This change was triggered by CVE-2024-7193, where a malicious actor created and distributed Mp3tag alongside a modified tak_deco_lib.dll, which contained malicious code.
Updated Code-Signing Certificate
I’ve updated the code-signing certificate that is used to digitally sign and verify the origin and integrity of Mp3tag’s installer and executable.
Bugfixes
This new version also includes a surprising amount of fixed bugs, so I recommend everyone to update — especially if something doesn’t work as expected.
Mp3tag v3.26
2024-05-24
Cover Thumbnails for Query Results from Tag Sources
When importing via Discogs or MusicBrainz, it was often difficult to decide which release to pick from the list of Tag Sources query results. Some had the correct cover, but for many, it often was a back-and-forth to decide which release to pick. This new version now adds support for Cover Thumbnails in the list of query results. You can even hover over the small thumbnail image to see a bigger version.
Copy as Text to Clipboard
Another often requested feature was a quick way of copying a textual representation of the selected files to the clipboard. There is this workaround of using Mp3tag’s export feature, but it’s often too powerful for the task at hand. This new version now offers Edit → Copy as Text… where you can use a format string to select what to copy to the clipboard.
Bugfixes and Performance Improvements
Last, this release fixes a lot of long-standing bugs. Beyond that, there is a significant increase in performance when writing tags via the Tag Panel, Extended Tags, or the converters. It’s quite nice!
Archive of selected release notes prior to Mp3tag v3.26.