How this tool computes its result
The rotate and flip tool applies FFmpeg pixel transforms locally in the browser. A 90-degree or 270-degree turn swaps width and height; 0 and 180 degrees retain the original dimensions. Because the transform is applied to the video frames, it can fix sideways phone footage or create a mirrored video that remains corrected when opened in another player. MP4, MOV, WebM, and source-format output are available.
