How to trim a video
Open the video, drag the two handles to the part you want to keep, and press Save. Fast mode copies the video as it is, so it takes seconds and loses no quality.
Open the video
Drop an MP4, MOV, WebM or MKV video on the page, or choose one. Only its headers are read to open it, so even a long video opens in a moment.
Mark the part to keep
Drag the start and end handles on the timeline, or type the times. Press play to watch just that part. On a handle, the arrow keys move it by a tenth of a second.
Choose Fast or Exact, then save
Fast is the default. The page shows where Fast will really start before you save. Save writes the new video to your Downloads; the original is not changed.
Fast or Exact?
Fast copies the picture and sound into a new file without decoding them, so the quality stays exactly the same and an hour-long video is done in seconds. A video is stored as keyframes, full pictures, with the frames between them drawn from the one before. A copy has to begin on a keyframe, so Fast starts at the keyframe at or before your start. Phones put one every one to a few seconds; the page tells you how far back it is before you save.
Exact decodes the part you keep and encodes it again, so it starts on the very frame you picked. It takes about as long as playing the part, or longer, and the picture is encoded once more.
| Fast | No re-encode, same quality, seconds. Starts at the keyframe at or before your start |
|---|---|
| Exact | Re-encodes, starts on your frame. Takes about as long as the part plays |
Where does the video go?
It stays on your device. Your browser trims the video in the background, and Save puts it in your Downloads folder. It even works offline once the page has loaded.
- Read in pieces on your device, so large videos fit
- The place and date a phone stored in an MP4 or MOV are kept
- Saved to your Downloads folder
Specs and browser support
| Opens | MP4, M4V, MOV, WebM and MKV with H.264, HEVC, VP8, VP9 or AV1 picture |
|---|---|
| Saves | The same format it opened; a MOV is saved as MP4, which holds the same picture and sound and plays everywhere |
| Sound | Copied as it is. Sound the new file cannot hold is re-encoded as AAC (MP4) or Opus (WebM, MKV) |
| Precision | Times to a tenth of a second. Fast starts at a keyframe; Exact on the frame |
| Size | No set limit: the video is read in pieces. The trimmed copy is held by the browser until it is saved, so a phone may run out of memory with very large files |
| Browsers | Fast works in every current browser. Exact needs the browser to encode video (WebCodecs): current Chrome, Edge and Safari, and Firefox on a computer. The page checks before you choose and says when a way is not possible |
| Price | Free, no watermark, no account |
Questions
No. Your browser reads and writes the video on your device. It stays on your device.
Fast copies the video without re-encoding it, so it has to start on a keyframe, a full picture that the next frames are drawn from. It starts at the keyframe at or before your start, and the page shows where that is before you save. Choose Exact to start on the frame you picked.
Not with Fast: the picture and sound are copied byte for byte. Exact encodes the picture once more, at a quality chosen for the video’s size.
Some browsers cannot play every format, for example HEVC or MKV in some versions of Chrome. Fast does not need to play the video to copy it, so you can type the start and end times and save.