Free Online Video Trimmer
Cut a video down to the part you need in under 2 seconds. Using lossless keyframe-aligned stream copy, everything happens locally in your browser with no upload and no quality loss.
When you only need to cut the beginning or end of a clip, uploading the whole file to a server can feel wasteful. GrepCut keeps your file on your device and trims it directly in your browser.
The trimmer uses WebCodecs and MediaBunny to read the media file, copy the already-encoded video and audio packets, and remux them into a fresh MP4. Because your browser does not need to decode and re-encode every frame, the export usually finishes in seconds.
A compressed video is not just a stack of complete pictures. Most frames depend on nearby frames, and keyframes are the safe points where playback can start cleanly.
That is why a lossless stream-copy trimmer may snap your cut to the nearest usable keyframe instead of cutting on any arbitrary frame. You get a fast, standard-compliant MP4, but the exported start or end can be slightly earlier or later than the handle position.
Is your video uploaded when you trim it?
No. Your file is processed locally in your browser, so it does not leave your device.
Will trimming lower your video quality?
No quality loss is introduced on the stream-copy path. GrepCut copies the encoded media from your selected range and remuxes it into a new MP4.
Why is your cut not frame-exact?
Lossless video trimming has to respect keyframes. If your chosen start or end time falls between keyframes, GrepCut aligns the cut to a nearby safe point so the exported MP4 plays correctly.
Can you cut out the middle of a video?
This trimmer keeps one continuous range. If you need to remove a middle section or make several cuts, open the clip in [GrepCut Studio](/).
Can you trim a large video file?
Yes, but your browser and device memory still matter. Because the file is handled locally, very large videos can be limited by your computer rather than by an upload limit.
Which browsers work best?
Use a browser with WebCodecs support, such as Chrome, Edge, or Opera. If your browser does not support the required media APIs, the trimmer may not run.
What file do you get after trimming?
You export an MP4 containing the selected continuous range. The goal is a broadly playable file without uploading or transcoding your whole video.