Cut a clip by start and end time or strip the audio track — processed on your device by FFmpeg compiled to WebAssembly, so the video never leaves your browser.
How to use Video Trimmer & Muter
Drop in a video (MP4, WebM, MOV, or MKV).
Pick Trim or Mute, then set the start/end times — use the Playhead buttons to grab the preview position.
Click the action button and download the result.
Frequently asked questions
Is my video uploaded to a server?
No — FFmpeg runs as WebAssembly inside your browser, so the file is processed entirely on your device.
Why is the cut not exactly where I set it?
The default fast mode copies the video stream without re-encoding, so the cut snaps to the nearest keyframe. Enable "Frame-exact cut" to re-encode for a precise cut (slower).
How large a video can I process?
Processing happens in browser memory, so short clips up to roughly 1 GB work best. Fast trim and mute finish in seconds since nothing is re-encoded.