Video Trimmer · Cut a Clip

How to trim a video (free)

1. Drop your video onto the box above, or click to choose one.
2. Set a start and end time — type them (like 0:07 and 0:21.5) or scrub the player and click set to playhead.
3. Pick Instant or Precise, click Trim video, and save the clip when it's done.

Instant vs. precise — pick the honest one

Instant mode stream-copies your clip with -c copy: no re-encoding, so it's lossless and finishes in seconds. The catch is that a stream copy can only cut on a keyframe, and many videos only place a keyframe every 2–10 seconds — so the clip may begin slightly before the time you asked for. After an instant trim, this tool measures the real result and tells you the actual start, so there are no surprises.

Precise mode re-encodes with H.264, so the cut lands exactly on the frame you chose. It takes longer and loses a tiny amount of quality, but the output is a universally-compatible MP4. Use instant for quick, lossless clips and precise when the exact in-point matters.

Real FFmpeg, running in your browser

This tool ships FFmpeg compiled to WebAssembly, so trimming happens inside your browser tab. Your video is never uploaded — nothing to leak, cache on a server or delete later — and there's no watermark on the result. The first run downloads the engine once, then it works offline.

Is there a size limit?

The whole video is loaded into memory to process it, so very large files (roughly above 1.5–2 GB, depending on your device) can run out of memory in the browser. For big files, instant mode is much lighter than precise mode.