Mp3tag is a free and powerful audio file tag editor for Windows. It allows you to edit metadata (information about the files) of various audio file formats, including MP3, but also FLAC, Ogg Vorbis, WMA, and many others. This metadata includes :

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Artist:

The name of the artist or band.
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Album:

The name of the album.
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Title:

The name of the song.
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Year:

The year the album or song was released.
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Genre:

The musical genre.
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Track number:

The order of the song on the album.
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Album art:

The cover image of the album.
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Comments:

Additional information.

Beyond simple editing, Mp3tag offers advanced features like:

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Batch processing:

Edit the tags of hundreds of files simultaneously. This is incredibly useful for organizing large music libraries.
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Automated tagging:

Automatically fill in missing tag information using online databases like MusicBrainz and Discogs.
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Filename to tag and tag to filename conversion:

Automatically rename files based on their tags or update tags based on the filename.
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Support for various tag formats:

It handles ID3v1, ID3v2, APEv2, and other metadata formats.
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Regular expressions:

For advanced searching and replacement within tags.
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Scripting:

Allows for even more advanced automation and customization using scripting languages.


Essentially, Mp3tag is a comprehensive tool for managing and organizing your digital music collection by efficiently and accurately editing the information associated with each audio file.