Convert videos from YouTube, Facebook, Instagram, Vimeo and many other video sites.
Plus you can use DearMob iPhone manager to transfer videos/music from computer to iPhone, or vice versa, make ringtone, etc
For HD Videos (>= 1080p): Get VideoProc to download UHD/HD video, music, playlist from 1000+ sites, convert video to nearly any format, for any device, trim, merge, crop, cut, edit video and more!
If you only want a part of the video to be converted, check Cut media file and choose the start and stop durations and the video will be cut for you.
Best alternative method: use VideoProc to download, record, convert, cut, merge, crop, adjust, compress any videos downloaded from online sites or process footages filmed by phone, camera, GoPro, drone, etc.