Please download and install 7thShare Any MP4 Converter on your computer at first.
Install and run Mac MP4 Video Converter, click the "Add File" button to import your videos. If you experience any problems adding videos by directly clicking the "Add" button, you can click "File -> Add file" to add the video files you want to convert from your computer.
You can click "Profile" drop-down list and input MP4 in the search box and iPad supported formats will be listed on the right, choose your needed one.
Click "Edit" button, you can optimize the video by setting some parameters. You can trim the video length, crop your unwanted edges, adjust the original video effect by modifying the Brightness, Contrast, Saturation, Hue and Volume.
In the last step, click "Convert" button, and you will convert any video to MP4 on Mac for your portable devices.