M4A MP3 Converter converts M4A to MP3 and MP3 to M4A. The software supports more than 30 audio and video file formats as input file, and converts to MP3, WAV, AAC, MP4, M4A, and M4B files. You can change encoding parameters of target files such as sample frequency, bit rate, channels, and quality. So it is possible to convert a large-size file to a smaller one. And, the software adds or keeps ID3 tag when converting. The software supports to change sound volume as well. M4A MP3 Converter supports M4A, M4B, MP4, M4V, MP3, WAV, AAC, WMA, WMV, ASF, OGG, OGA, CDA, FLAC, WV, AC3, AIFF, AIF, AIFC, AFC, APE, MPC, MPP, ADX, SPX, TTA, AU, SND, XM, IT, S3M, MOD, MTM, UMX, and MO3 file formats. The software also supports batch conversion. You can convert a batch of file at a time.