It is even capable of re-encoding your audio files into other bitrates, so it's possible to use it as a simple converter to shrink files that are too large because they are of too high quality. 16 Free Best Mp3 splitter and Joiner tools to split and merge Mp3 files . – If you have recently bought an MP3 player, you must be interested to dig further about how to split audio files or merge music files. Getting a new MP3 player is sure some excitement, however, we are left scratching our head when we think of blending a song list or sound tracks into one single file. One service above all others has been responsible for creating a viable commercial market for music online: iTunes. Before you merge mp3 online , you are allowed to set some advanced parameters including mode, audio bitrate etc. to meet your professional or casual needs. It is small and delicate with friendly and intuitive interface that you can operate with ease. The most important point is that it is totally free of charge. Step 1 Add multiple MP3 files There are four methods to import MP3 files into the program. Here we list the two easiest ones: