How does the Video Trimmer work?

It uses FFmpeg compiled to WebAssembly, running entirely in your browser. You specify a start and end time, then choose whether to keep that selection (Trim) or remove it (Cut). No data is ever sent to a server.

What is the difference between stream copy and re-encode?

Stream copy (-c copy) is very fast and lossless — it cuts at keyframes without re-encoding. Re-encode is slower but frame-accurate, letting you cut at any exact point in the video. Use stream copy for speed and re-encode for precision.

Are my video files uploaded to a server?

No. All processing happens 100% in your browser via WebAssembly. Your video files never leave your device — complete privacy is guaranteed.

Video Trimmer

Trim or cut video clips online — free, instant, and 100% private. Keep a selection or remove a section from MP4, WebM, MOV, AVI, MKV. Stream copy (fast) or re-encode (precise). All processing in your browser via FFmpeg WASM.

Your data never leaves your device

Frequently Asked Questions

How does the Video Trimmer work?

It uses FFmpeg compiled to WebAssembly, running entirely in your browser. You specify a start and end time, then choose whether to keep that selection (Trim) or remove it (Cut). No data is ever sent to a server.
What is the difference between stream copy and re-encode?

Stream copy (-c copy) is very fast and lossless — it cuts at keyframes without re-encoding. Re-encode is slower but frame-accurate, letting you cut at any exact point in the video. Use stream copy for speed and re-encode for precision.
Are my video files uploaded to a server?

No. All processing happens 100% in your browser via WebAssembly. Your video files never leave your device — complete privacy is guaranteed.