MP3 Reduce

MP3 Reduce is one of the tools that can help you save disk space, as the application has been designed to compress MP3 files with just a few clicks.
And while it all sounds very interesting, MP3 Reduce actually reduces the audio quality of the selected MP3 files, so you may end up with smaller songs, but with a terrible quality.
The main window of the app is the one that gives you access to the most important features of the tool, providing two separate panels for picking the source files and the destination folder.
In addition, it allows you to choose the new kbps value from the get go, which can be either 128, 96, 63 or 32, with the last one providing the best compression but also the lowest audio quality.
The process is completed in no time, but MP3 Reduce also comes with a few other goodies, such as a tag editor and a WAV conversion tool for converting MP3 files to WAV.
Another good thing about the program is that it integrates a simple player to preview any of the selected files, while a separate tool lets you save, import, edit and delete M3U playlists.
MP3 Reduce works flawlessly on all Windows versions and doesn't hamper system performance, without the need for administrator privileges on Windows 7.
All in all, the application does what it says, but always keep your original files because you can't go back to a higher quality once you compress it.