MP4 Joiner has been replaced by MP4 Tools (Joiner and Splitter). It is a user-friendly set of tools which allows you to join and split MP4 files without needing to reencode and without affecting sound quality.

MP4 Tools screenshots

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How to Download MP4 Tools

Pick your file - the one marked Recommended fits your device.
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Run the installer and follow the steps. Not starting? Try another server or a different browser.

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