How to use
- Drop in or select a video file (MP4, WebM, MOV, MKV, AVI, and more).
- Enter the start and end time in seconds or mm:ss (e.g. 0:10).
- Click Trim and wait for the engine to cut your clip.
- Download your trimmed video.
Frequently asked questions
Does my video get uploaded anywhere?
No. Everything runs locally in your browser with ffmpeg.wasm, so your video never leaves your device — nothing is uploaded to any server.
What video formats can I trim?
You can trim common formats such as MP4, WebM, MOV, MKV, AVI, and OGV. The trimmed clip is saved in the same container as your source file.
What time format should I use for start and end?
Enter plain seconds (e.g. 90) or mm:ss / hh:mm:ss (e.g. 1:30). Both forms are understood directly.
Will trimming reduce the quality of my video?
No. The cut uses a lossless stream copy with no re-encoding, so the trimmed clip keeps the exact quality of the original.
Why is the first run slow?
The first trim downloads the ~30 MB ffmpeg engine. After that it is cached and runs instantly, even offline.
Why does my cut start slightly before the time I entered?
Lossless copy mode cuts at the nearest keyframe rather than re-encoding every frame, so the start point may snap to the closest keyframe. This keeps quality intact and processing fast.
About this tool
Free online video trimmer that cuts a clip by start and end time entirely in your browser with ffmpeg.wasm. Fast, lossless, no upload, no account, 100% private.