Video Trimmer — Cut a Clip from a Video

Video Trimmer cuts the part you want out of a video and saves it as a new file, in the same format it came in: an MP4 stays an MP4, a WebM stays a WebM, a MOV stays a MOV. Choose the video, then set the start and the end — type them, or play to a moment and press Start here or End here — and press Play this part to check it. There are two ways to cut. Keep quality copies the video’s frames exactly as they are, so nothing is lost and even a long clip takes seconds; a clip has to begin on a key frame (a full picture the frames after it are built from), so the frames from the key frame before your start come along — hidden in MP4 and MOV, so it plays from your start, but shown in WebM and MKV. Exact encodes the picture again at high quality, so the clip starts and ends on the very frames you chose; it takes about as long as the clip plays, longer on a phone. You can also remove the sound. Everything happens in this browser tab, using the browser’s own video decoders and encoders; the video is never uploaded.

1. Choose or drop a video (MP4, MOV, WebM or MKV).
2. Set the start and the end: type the times, or play to a moment and press Start here or End here.
3. Press Play this part to check it.
4. Choose Keep quality (fast) or Exact (re-encode), and whether to remove the sound.
5. Press Save the clip. It is saved with its times in the file name.

• In WebM and MKV, Keep quality starts on the key frame at or before your start — up to a few seconds early (most phone videos have one every one or two seconds, some screen recordings far fewer). Use Exact when the first frame matters.
• Exact needs a browser that can encode video in the page (WebCodecs): recent Chrome, Edge, Safari and Firefox can. Where it cannot, only Keep quality is offered.
• The clip is built in memory before it is saved, so a clip of several gigabytes may fail on a phone; cut a shorter part.
• The player shows only videos the browser can play. A file it cannot play (HEVC in some browsers, for example) can often still be cut with Keep quality — type the times.
• Subtitles and chapter marks are not carried into the clip.
• The video is read in this tab, a piece at a time, and never uploaded. The clip is made in the tab’s memory and saved straight to your device. Nothing is kept after you leave the page.

Not with Keep quality: the frames are copied, not re-encoded, so the clip is identical to that part of the original. Exact encodes the picture again at high quality, which changes it slightly.

In a WebM or MKV clip made with Keep quality: it must begin on a key frame, and the nearest one before your start is used so nothing you asked for is lost. MP4 and MOV hide those frames. Choose Exact to start on the very frame in any format.

Yes. Turn on Remove the sound before saving. To mute the whole video, leave the start at 0 and the end at the end; with Keep quality the picture is copied unchanged.

No. It is read and cut in your browser, on your device. You can turn off the internet after the page has loaded and it still works.

MP4, MOV and M4V, WebM and MKV. The clip is saved in the same format as the original.