MovieShort AI is a free, open-source tool that automatically extracts the best moments from full-length movies and formats them as YouTube Shorts, TikTok, Reels. It uses AI to score every scene, tracks people on screen with computer vision, crops to vertical 9:16, and generates word-level subtitles - all locally on your machine. No cloud. No subscriptions. Built on PySceneDetect, faster-whisper, OpenCV, and FFmpeg, it runs on Python and gives you full control over the output.