Freeware cda to mp4 online converter more: how do I batch convert cd to mp4 cent difference convert cda to mp4 format above Free Audio Converter is a tool that does exactly that. It can convert between MP3, M4A, AAC, WAV WMA and OGG files, unfortunately not the lossless FLAC format. However, that covers most formats you might see, and it almost couln't be easier to use. CoreConverter: Has the ability to read filenames when encoded with Multi-Encoder CoreConverter: can pass ReplayGain tags to encoders which need them (such as [audio info]) CoreConverter: updates the 'Source' 'Encoder' 'Encoded By' and 'Encoder Settings' tags when converting CoreConverter: Tries for 2 seconds to write IDTags after encoding (in case another program has the file locked, such as virus checker)