Ultimate M4a to MP3 Converter is a free no-nonsense easy to use audio converter. Utilizing the latest in MP3 encoding technology, our converter generates professional quality, crystal clear audio files. With our user-friendly and modern interface, you can quickly convert M4a audio and M4b audiobooks into the highly compatible and portable MP3 format. Drag and drop support allows you to easily add all your files at once for batch processing. You can output to the original source folder, or any specified custom folder. Metadata tags and cover artwork are preserved in the output files. Encoding settings for CBR and VBR modes, bit rate, sample rate and channels. Option to shutdown computer after conversion is finished. Works with Windows 10/8.1/8/7/Vista/XP.