Video · 10
Video trimmer
Keep the part you need. The cut is re-encoded so the first frame is the frame you asked for, not the previous keyframe.
How to use it
Drop an MP4, MOV, or WebM the browser can time. Start and end are seconds. The end fills in with the duration when the file loads.
The job uses -ss and -to before the input is fully decoded into a new H.264 and AAC file. That is slower than a stream copy and more accurate. A stream copy would snap to keyframes and can start a second early.
Three minutes or 200 MB is the limit. Longer masters belong in an editor. This page is for the clip you are about to post.
Tips
- Set the end a few frames after the action so the last gesture is not chopped.
- If the audio pops at the cut, the source had a transient there. Trim a little earlier or fade it in your editor.
- Mute afterwards if you only wanted the picture. Trimming keeps the audio.
FAQ
Why re-encode instead of cutting the file?
A byte-level cut starts on a keyframe. Re-encoding starts on the timestamp you typed.
Does this edit the original?
No. The download is a new MP4. The file you dropped is unchanged.
Can I trim without sound?
Trim here, then run Mute video, or the other way around. Each page does one job.
License
Encoding uses the single-thread ffmpeg.wasm build shipped with Cutshed. The JavaScript wrapper (@ffmpeg/ffmpeg and @ffmpeg/util) is MIT. The core binary is GPL-2.0-or-later because the build enables GPL components, including libx264, libmp3lame, libvorbis, and native AAC and FLAC. That license covers the encoder, not your recording.