How to crop a video
1. Drop the video and wait for the frame. 2. Drag the box, or drag a corner. Pick Square or 9:16 if the shape must stay fixed. 3. Press “Crop video” and download the MP4.
The frame is a share of the picture, the same idea as Crop image. Arrow keys nudge it. Shift moves it further.
The picture is re-encoded
FFmpeg cuts the pixels you kept and writes a new MP4. Sound is kept when the file has it. This does not change the length: use Trim video for that, and Resize video when you only want a smaller frame without cutting the edges.
Phone clips and margins
Use this to drop black bars or to make a 16:9 clip into a square for a post. The cut uses even pixel sizes so the file plays. A password is not involved. The video stays in this tab.