Video Trimmer
Upload a video to trim or drag and drop
MP4, MOV, WebM, MKV and more. Everything happens in your browser - nothing is uploaded.
Runs entirely in your browser using ffmpeg compiled to WebAssembly. Your video is never uploaded. Trimming copies the original streams where possible, so it is fast and keeps full quality; some formats are re-encoded to MP4 for a clean cut.
Need just one part of a video? Upload your clip, drag the start and end handles to the section you want, and download the trimmed result. It is perfect for cutting dead air off the front of a screen recording, keeping the best few seconds of a longer clip, or removing something at the end. Where the format allows, the trim copies the original video without re-encoding, so it is fast and keeps full quality. Everything runs in your browser with ffmpeg compiled to WebAssembly, so the video is never uploaded.
How to use this tool
- 1Upload a video (MP4, MOV, WebM, MKV, and more).
- 2Watch the built-in preview to find the part you want to keep.
- 3Drag the Start slider to where the clip should begin, and the End slider to where it should stop.
- 4Use Preview start and Preview end to jump the player to each point and check it.
- 5Click Trim video, then download the trimmed clip.
Example
Upload a two-minute screen capture that starts with a few seconds of fumbling. Drag the Start slider to 0:06 and leave the End at the finish, then trim. You get a clean clip that starts right at the action, usually with no quality loss because the streams are copied.
Upload a one-minute clip, set Start to 0:32 and End to 0:42, and trim. The tool keeps exactly those ten seconds and downloads them as a new file, leaving the original untouched on your device.
Common use cases
- Cutting the pause or setup off the front of a screen recording
- Keeping a short highlight from a longer phone video
- Removing the end of a clip after the useful part finishes
- Trimming a video down before turning it into a GIF or compressing it
- Grabbing a single scene to share in a message or post
Common mistakes
- Setting the end before the start - the sliders keep a small gap, but always check the 'Keeping' summary shows the length you expect.
- Expecting a frame-perfect cut on a copied trim - stream copy snaps to the nearest keyframe, so the start can shift by a fraction of a second; the re-encode fallback is exact.
- Trimming a very long video on a phone - reading a large file uses memory, so long clips are smoother on a desktop.
- Forgetting the original is unchanged - trimming downloads a new clip and never edits or deletes your source file.
Frequently asked questions
Is my video uploaded anywhere?
No. Trimming runs entirely in your browser using ffmpeg compiled to WebAssembly. The video never leaves your device, which makes it safe for private or unreleased footage.
Does trimming reduce the quality?
Usually not. Where the format allows, the trim copies the original video and audio streams without re-encoding, so the clip is identical in quality to the source. Some formats are re-encoded to MP4 for a clean cut, which is a very small quality change.
What is the difference between trimming and cutting?
They are the same thing here. You choose a start and an end, and the tool keeps everything between them and drops the rest. To keep a middle section, set the start after the intro and the end before the outro.
Why is my cut a little off from where I set it?
Fast trimming copies the video and can only start on a keyframe, so the start may move by a fraction of a second. If you need an exact cut, use a format that triggers the re-encode path, such as trimming and letting it export an MP4.
What formats can I trim?
Common formats all work as input: MP4, MOV (iPhone and Mac), WebM, and MKV, among others. The trimmed clip keeps the original format when the streams are copied, or exports as MP4 when a re-encode is needed.
Is there a length or size limit?
There is no fixed limit, but everything runs in your browser using your device's memory. Very large or long videos use more memory and are best handled on a desktop rather than a phone.
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