MP3 Splitter Joiner Pro can split, cut, trim a large MP3 file into multiple smaller pieces, and join, merge multiple MP3s into a single file. You can split a MP3 file by file size, pieces count, time or custom selections. It provides with a slider bar to visually position the cuts where you want. You can also preview every custom piece and, set forward and backward overlap and ID3 tags. To save your time, MP3 Splitter Joiner Pro also supports batch split, you can split a batch of MP3 files at a time. It splits MP3 files directory without re-encoding, so it is fast and exactly keeps sound quality of original MP3s. The MP3 Joiner can join not only same encoding parameters MP3s but also different encoding parameters MP3s. You can also customize the encoding parameters of target MP3 file.