MP3 Diags is a graphical user interface-based application that enables users to identify issues with their MP3 files, fix some of the problems, and make other modifications such as adding track information.

It also lets you "look inside" an MP3 file.

Unlike some programs that are designed to deal with a single topic (like fixing VBR headers or adding cover art), MP3 Diags is a one-stop solution that identifies more than 50 different issues in MP3 files and provides the means to fix many of them.

MP3 Diags can fix broken tag, headers and audio as well as duplicate tags and headers. It can also correct the incorrect placement of tags and headers including ID3V2, ID3V1, LAME, Xing. It can also address many other issues including low-quality audio, missing VBR header, missing track info or cover art and broken track info and cover art, missing normalization data, and character encoding issues.