Lossless Video Trimmer

Set in/out points on any MP4 or WebM video and capture the trimmed segment using the browser's MediaRecorder API. No re-encode needed for WebM; MP4 is re-wrapped as WebM. Everything runs in your browser — your video is never uploaded.

100% freeNo sign-upRuns in your browserNo upload · data stays private
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⚠️ Browser limitation: True lossless MP4 trimming requires ffmpeg. This tool uses MediaRecorder, which re-encodes in WebM (VP8/VP9). For lossless MP4 frame-accurate trimming, use ffmpeg -ss [start] -to [end] -i in.mp4 -c copy out.mp4 on the command line.

How to use this tool

  1. Upload a video and use the player to find your in/out points.
  2. Click "Set In at current time" and "Set Out at current time" buttons while the video is paused at the right frame.
  3. Click "Trim & Download" — the browser records the segment in real time and downloads the WebM clip.

Why it's private

Trimming uses the browser's MediaRecorder API and HTMLVideoElement. Your video is processed locally and never sent anywhere.