MP3 Splitter Joiner Pro can split a large MP3 file into multiple smaller pieces, and join multiple MP3s into a single file. You can split a MP3 file by file size, pieces count, time or custom selections. MP3 Splitter Joiner Pro provides a time slider bar to visually position the points where you want to split. You can also preview every custom piece and, set fade in and fade out effect, 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. The software splits MP3 files directly without re-encoding, so it is fast and exactly keeps sound quality of original MP3s. MP3 Splitter Joiner Pro joins MP3 files that were encoded by not only same encoding parameters but also differences. The encoding parameters of target MP3 file can also be customized. The program supports batch join as well.