Video Cutter (Trim Video)

Trim the dead air at the start of a recording, keep only the goal from a match, or cut an awkward minute out of the middle. This cutter runs in your browser with the ffmpeg video engine (about 30 MB, downloaded once) and never uploads your video. Fast mode copies the video data without re-encoding, so it is instant and loses no quality; precise mode re-encodes so the cut lands on the exact frame.

How to use this tool

1. Choose the video.
2. Enter the start and end of the part (for example 0:45 and 2:10). Leave the end empty to go to the end of the video.
3. Choose whether to keep that part or remove it and join the rest.
4. Pick Fast (lossless, keyframe accuracy) or Precise (frame-accurate), press Calculate and download the result.

Formula

Kept length = end − start · Length after removing = total − (end − start)

Compressed video stores a full picture (keyframe) only every few seconds; the frames in between are differences. A cut without re-encoding must start at a keyframe, so fast mode may begin up to a few seconds before your start time. Precise mode decodes from the previous keyframe and starts exactly where you asked.

Example

From a 10:00 recording, removing 3:15–4:05 leaves 10:00 − 0:50 = 9:10. Keeping 3:15–4:05 instead gives a 50-second clip; in fast mode it may start at the keyframe at, say, 3:13, making it 52 seconds.