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MP4Tools is a collection of simple free tools to join and split MP4 files.
It is Free software distributed under the GNU General Public License (GPL).

Free mp4 joiner

About

MP4Tools is a collection of cross-platform free tools to manipulate MP4 files. It contains following applications:

MP4Joiner is a free application that allows join multiple MP4 files into one without reencoding and without quality loss.
MP4Splitter is a free application that allows split a MP4 file in multiple files without reencoding and without quality loss

It is Open Source Software and is completely free.