A free program for Android, by UPlayer.

Get rid of any unwanted parts of your videos with the Video Crop & Trim (Video Cut) app for Android. This function, plus the app’s aspect ratio support, allows you to create a video that’s flawless and ready for posting on your social media channels. You can also cut a portion of your videos and send them to friends.

It supports different video formats; MP4, MOV, M4V, MKV, WMV, RMVB, FLV, AVI, 3GP, TS, etc.

What’s more, you can convert the videos into audio format and use the app to cut those files and use them create a custom ringtone for your device.