Perfect

I do time-lapses of my artwork, and this is the only app Ive found that will take my videos and crop them to whatever ratio I need for social media purposes, all while keeping the high resolution when I save them to my camera roll.

Kristindunreath about Crop Your Videos - The Rotate, Trim, Square and Zoom Photo & Video Cropper for Movies and Photos with Free or Fixed Camera Aspect Ratio Cropping App