PromptVideo: AI Timeline Copilot

Overview

A browser-based video editor you control by describing the edit. Google Gemini 3.5 Flash Lite translates prompts like "split at 4.2s and cut the dead air" or "zoom in 25% on the speaker" into deterministic edits on a multi-track Remotion timeline, and follow-ups like "make it bigger" update existing elements instead of creating duplicates. The editor includes stackable video, text, and zoom tracks, razor splitting, drag-and-trim, on-frame text dragging with magnetic snapping, multi-clip stitching, and a fully client-side MP4 export with pixel-for-pixel parity to the live preview.