Cut a video to keep only the part you want — set start and end times. No upload, no server.
This tool trims a video file to keep only the segment between the start and end times you specify. It uses stream copying (-c copy) when possible, which means the trimming is near-instant and lossless — no quality is lost because the video is not re-encoded.
The entire operation runs in your browser via ffmpeg compiled to WebAssembly. Your video is never uploaded to any server. The first use downloads the ffmpeg engine (~31 MB), cached for subsequent uses.
Stream copying works best when the start point falls on a keyframe. If the result has a few extra frames at the beginning, it is because the nearest keyframe was before your chosen start time — this is a fundamental limitation of video codecs, not a bug.
No. Everything runs locally via WebAssembly.
Video codecs store frames in groups. Trimming can only start at a keyframe boundary, which may be slightly before your chosen start time.
No — the tool uses stream copying, which preserves the original quality bit-for-bit.
MP4 (H.264) and WebM (VP8/VP9). The output is always MP4.
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Vai.la is not responsible for how the tools are used or for decisions made based on their results.