Video Cropper

Crop a video by image area and time range, keep audio when available, change playback speed, and export the result as an MP4 file. All processing is completed in your browser.

Exports MP4 in the browser with ffmpeg.wasm. Audio is kept when the source video has an audio track.

Usage and specifications

How to use this tool

Load a video, select the crop rectangle and set start and end times. Check speed and FPS, then export MP4. Download and review the result after processing.

Understanding the result

Combine a spatial crop with a time trim. Audio can be included when the source contains an audio track.

When to use it

Remove unused screen area from a demo, make a shorter explanation clip or trim unnecessary footage from either end.

Practical tips

Test a short segment first for picture, audio and speed. Processing uses browser memory, so long or high-resolution files can take time.

Worked examples

Keep a ten-second segment

Input / settingsResult
Start 5 seconds, end 15 seconds, speed 1×
Approximately 10 seconds of video; encoding can introduce small differences

Specifications and limitations

  • MP4, WebM and MOV files up to 300 MiB are accepted. Codec support varies even when extensions match.
  • The processing engine loads in the browser when exporting. Closing or reloading the page interrupts processing.
  • Available memory and browser support affect which files can be processed. Keep your original video separately.