Runs on your device · Your file never leaves your device.
Scrub to where the good part begins, press "Set start here", scrub to where it ends, press "Set end here", and download only that. The quick buttons cut the first 10, 15, 30 or 60 seconds for a story, a status or a short. Times can also be typed as mm:ss or plain seconds.
By default the cut is a stream copy: the video and audio are not re-encoded, so it finishes in seconds even on a long recording and the picture is byte-for-byte what it was. The trade-off is honest — a copy can only start on a keyframe, so the start may land up to a second or two before the time you chose. Switch on "Precise cut" and the clip is re-encoded to H.264 for a frame-exact edge.
Everything runs on your device with a video engine that downloads once (about 30 MB) and is then cached. Files over 1 GB are trimmed in parts that fit in memory and joined back together; the file itself never leaves your browser.
How to Trim a video: cut the start and the end
Add the video and, if you like, press Inspect to see its length.
Set the start and end — from the preview, the quick buttons, or by typing times.
Press Trim and download the MP4.
Supported formats and limits
Input
MP4, MOV, MKV, AVI, WebM, MPG, 3GP, TS, VOB and more
Output
MP4 (H.264 + AAC)
Fast cut
Stream copy at the nearest keyframe — no re-encoding, no quality loss
Precise cut
Frame-exact, re-encoded to H.264
Where it runs
In your browser; nothing uploaded
Not for: Cutting several pieces out of the middle in one go — trim keeps one continuous range; run it twice and use the Join tool for two separate ranges.
Frequently asked questions
Are my files uploaded to a server?
No. This conversion runs entirely inside your browser using your own device’s processing power. The file never leaves your computer or phone, which is why it also works when your connection drops.
Why does my clip start slightly before the time I set?
The fast cut copies the streams without re-encoding, and a copied stream can only begin at a keyframe — typically every one to ten seconds. Turn on "Precise cut" to have the clip re-encoded and start on the exact frame.
Does trimming lose quality?
Not with the fast cut: the picture and sound are copied exactly as they are. The precise cut re-encodes the picture to H.264 at the same quality setting the converter uses, which is visually transparent for almost everything.
What format do I get back?
An MP4 (H.264 + AAC) that plays everywhere. If the source uses a codec MP4 cannot carry, the picture is re-encoded automatically and the tool tells you so.