If you have to convert MP4 files to MP3, or you want to convert the MPEG4 to MP3 audio for the music only. You need turn to MP4 to MP3 Converter software for media conversion. Here we recommend you Aimersoft Video Converter, which can extract audio from video and convert it to audio format like WMA, MP3, M4A, AAC, OGG, MKA, FLAC etc. with super fast speed.
This guide shows you how to convert MP4 to MP3 with only three steps. Before we move on to cover how to convert the files, let's go over the main differences between MP4 and MP3.
MP4 (MPEG4 Part 14): MP4 is used for audio and video. This file type enables for high quality streaming over the internet and next generation cell phones - making MP4 players a hot item - and can be downloaded online at sites like MP4advanced, which I strongly recommend. MP4 players are available for download online.
There are 2 main types of MP4 files. The first type is called Simple Profile, which is used for low resolution digital video content, popularly used for online distribution. The second version is called Advanced Video Coding, which is a higher quality format used for HDTV content.
MP3 (MPEG-1, Layer 3): MP3s are small, high quality audio files that can be played on MP3 players or software. An MP3 can be easily created using a home computer, a ripper program that copies a song from a CD to your computer, and an encoder that converts your music to MP3 format.
So in basic terms, MP3 is for audio files used on MP3 players and software, and MP4 is for audio/video files used for internet streaming and high tech cell phones.
Now free download the MP4 to MP3 Converter, Aimersoft Video Converter and install it, then follow the guide to convert MP4 to MP3 easily!

Note: For Mac users, here is Mac Video Converter for you.