Cross platform GUI tool for lossless trimming / cutting of video and audio files using ffmpeg
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Latest commit e9edf47 Feb 18, 2018

LosslessCut 🎥 Travis

Simple, cross platform tool for lossless trimming/cutting of video and audio files. Great for rough processing of large video files taken from a video camera, GoPro, drone, etc. It lets you quickly extract the good parts from your videos and discard GBs of data without losing quality. It doesn't do any decoding / encoding and is therefore extremely fast. This app uses the awesome ffmpeg (included) for doing the grunt work.



  • Lossless cutting of common video and audio formats
  • Take full-resolution snapshots from videos in JPEG/PNG format
  • Change rotation/orientation metadata in videos. Great for rotating phone videos that turns out the wrong way without actually re-encoding the video.

Installing / running

Supported platforms

  • Mac OS X
  • Windows (64/32bit)
  • Linux (64/32bit, not tested)

Supported formats

Since LosslessCut is based on Chromium and uses the HTML5 video player, not all ffmpeg supported formats will be supported. The following formats/codecs should generally work: MP4, MOV, WebM, MKV, OGG, WAV, MP3, AAC, H264, Theora, VP8, VP9 For more information about supported formats / codecs, see Note that the MPEG TS format is not supported. See known issues.

Typical workflow

  • Drag drop a video file into player to load or use /CTRL+O.
  • Press SPACE to play/pause
  • Select the cut start and end time. Press I to select the start time, O to select the end time for the cut.
  • Press the rotation button if you want to override orientation metadata
  • Press the scissors button to export the slice
  • Press the camera button to take a snapshot

The original video files will not be modified. Instead it creates a lossless export in the same directory as the original file with from/to timestamps. Note that the cut is currently not precise around the cutpoints, so video before/after the nearest keyframe will be lost. EXIF data is preserved.

Keyboard shortcuts

Press h To show/hide list of shortcuts

For old shortcuts see here:

Known issues

  • Some output videos will have an empty portion in the beginning (you might lose a few seconds after your in-cutpoint). A tip is to set the cutpoint a few extra seconds before the part you want to keep, that way you will not lose anything. See discussion in #13
  • If you get an error when cutting any kind of file under Windows, please check your anti-virus. It might be blocking execution of ffmpeg, see #18
  • Unsupported files can be losslessly remuxed to for example mp4 first with the following command: ffmpeg -i input.ts -acodec copy -vcodec copy out.mp4

Development building / running

This app is built using Electron. Make sure you have at least node v6 and yarn installed. The app uses ffmpeg from PATH when developing.

git clone
cd lossless-cut


In one terminal:

npm run watch


npm start

Release new version

# Commit changes
# Wait for Travis
npm version ...
# Update
# Commit
# Push
npm run download-ffmpeg
npm run extract-ffmpeg
npm run build
npm run icon-gen
npm run package
npm run release