Free Video Trimmer
Cut any part of a video, choose Precise or Fast, and drop the sound if you like. Your video is processed in your browser and never uploaded.
Your video is processed in your browser and never uploaded to a server.
Frame-accurate: the cut is exactly the frames you chose. It re-encodes, so a long video takes longer.
Your trimmed video
Choose a video file, pick the part to keep on the timeline, then click Trim and export.
How to Trim a Video
Three steps, all in your browser.
Choose a video file
Pick an MP4, MOV, WebM or MKV video from your device, or drag it onto the upload box. Nothing is uploaded to a server.
Drag the handles to pick the part
Drag the start and end handles on the timeline and the picture jumps to that frame, or type the times. Play the selection to watch it first.
Choose a method and export
Precise is frame-accurate; Fast skips re-encoding and takes seconds. Mute the sound if you like, click Trim and export, then watch the result and download it.
Why Use the SonusVid Video Trimmer
Your Video Never Leaves Your Device
Trimming runs entirely in your browser. Your video is never uploaded to any server.
Free and Unlimited
No sign-in and no credits. Trim as many videos as you like.
Choose the Cut by Eye
The timeline shows the video's frames, and dragging a handle jumps the picture to that frame, so you can see exactly where you cut.
Precise or Fast
Precise re-encodes so the cut is frame-accurate; Fast copies the video untouched, lossless and in seconds.
Drop the Sound if You Like
Export a silent video in one click, handy when you plan to add new music to the picture.
Works With Common Video Formats
MP4, MOV, WebM and MKV, up to 500MB per video with no length limit. The result keeps the original format.
Trimming Video: Precise, Fast and Formats
Precise or fast: what is the difference?
A video is stored as compressed frames. Fast trimming copies those frames untouched into a new file, so it is lossless and finishes in seconds. Precise trimming decodes the frames and encodes the clip again, which takes longer but lets the cut land on exactly the frame you chose.
Choose Fast when you want the original quality and can accept a start that is a little early. Choose Precise when the exact frame matters, for example when you are cutting a thumbnail, a loop or a beat-matched clip.
Re-encoding gives a picture close to the original but not identical, because the clip is compressed once more. The wait depends on the length of the part you keep, not on the length of the whole video.
Why a fast cut can start early
Not every frame in a video is complete. A keyframe stores a whole picture, and the frames after it store only what changed. A frame in the middle of the video cannot be shown without the keyframe it depends on.
Fast trimming does not re-encode, so it has to begin at a keyframe. If you place the start between two keyframes, the cut moves back to the one before it and the clip begins a little early. The gap depends on the video and is often a second or two.
Precise trimming has no such limit, because it builds a new keyframe at your start. That is why the cut is exact, and why the picture above jumps to the very frame you chose as you drag a handle.
MP4, WebM or MKV: which format stays?
The trimmed video keeps the format of the original. An MP4 stays an MP4, a WebM stays a WebM and an MKV stays an MKV, and a MOV is saved as an MP4. The tool changes how long the video is, not its container.
MP4 is the safest choice for sharing: phones, browsers and most editors play it. WebM is made for the web and plays in browsers, though not every editor opens it. MKV can hold almost any kind of video and audio, but fewer phones and editors open it directly.
If you need another format afterwards, trim first and convert the shorter file: there is less to convert.
Precise and Fast Compared
How the two methods differ in start point, quality and speed.
| Compared | Precise | Fast |
|---|---|---|
| Where it starts | Exactly the frame you chose | On a keyframe, which can be a little before your choice |
| Quality | Close to the original; the clip is compressed once more | Identical to the original; nothing is re-encoded |
| Speed | Slower, growing with the length of the part you keep | A few seconds |
| Best for | Thumbnails, loops, beat-matched clips | Quick cuts where a second or two does not matter |
- Neither method changes your original video, and neither uploads it.
- Keyframe spacing varies from video to video; how early Fast starts depends on the nearest keyframe before your choice.
- If a video can't be copied as it is, Fast re-encodes it instead of dropping the picture.
Video Trimmer FAQ
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