Video Trimmer
Trim a video by start/end time (fast lossless copy first, precise re-encode when needed)
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🔒 Everything runs 100% in your browser. Your files and input are never uploaded to any server.
Set a start and end time to trim just the segment you want from a video. By default it copies the stream directly without re-encoding (-c copy), which is very fast and lossless; when you need frame-accurate cuts, you can enable the re-encode option. Your file is never uploaded and is processed only in your browser.
How to use
- Drag and drop or click to select your video file.
- Watch the preview and adjust the start-time and end-time sliders.
- Leave it as-is to save quickly, or enable "Precise trim (re-encode)" if you need frame accuracy.
- Click "Trim Segment," and when it's done, check the result and download it.
FAQ
- Are my files uploaded to a server?
- No. Trimming runs only via WebAssembly (FFmpeg) in your browser, and your video is never uploaded externally. That said, the first run has to download the conversion engine (a few tens of MB), so the initial time may be a bit slow.
- It's a lossless copy, but the start point is slightly off.
- The -c copy method is very fast and lossless but can only cut on keyframes, so the start may shift slightly earlier. To cut with frame accuracy, enable "Precise trim (re-encode)" (though it takes longer).
- What format is the result?
- In lossless copy mode it's saved in the same format as the original (e.g., mp4, webm), and in re-encode mode it's saved as widely compatible MP4 (H.264).