How do I converter mp4 to mp3 free download More hints: mp4 to mp3 converter free online note economic free mp4 to mp3 converter download press Output Formats: AAC, AC3, AIFC, AIF, AIFF, AMR, APE, AU, CAF, CDA, FLAC, GSM, M3U, M4A, M4R, MP3, MPC, OGG, PLS, RAW, SPX, VOX, WAV, WMA, and WPL This happens because both MP3 and Ogg Vorbis use "lossy" compression schemes, so they throw away part of the audio information in order to decrease the size of the output file: when you convert a full quality audio source (like a CD audio or a Wav or a Flac file) to Ogg Vorbis, the compression will throw away some information, and again when you convert from Ogg to MP3 the encoding process will throw away other information.