A free program for Android, by kkapps.

Video Converter eliminated the need to convert videos using a third-party website. With this app, you can save video files in various formats including MP4, MOV, and the like. These files can be found in the VideoConverter folder for your convenience. Conversion is fast, making the app the best choice for time-strapped individuals. It also functions as a mini editing app as you can also compress or trim videos to your liking. 

This tool is lightweight so it may not consume much of your device’s storage or CPU. Further, it is compatible with phones and tablets with Android 4.4 and newer, ensuring accessibility for users with low-end devices.