MP4 MP3 Converter converts MP4 to MP3 and MP3 to MP4. 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, you can add ID3 tag when converting file to MP3. The software supports to change sound volume as well. MP4 MP3 Converter supports MP4, M4V, M4A, M4B, 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.