Trim and Cut Video Online
Processing entirely on your device — large files may take a moment.
Enter the start and end time in seconds and download just that segment. The cut copies the streams instead of re-encoding, so it is fast and keeps the original quality.
Because no re-encoding happens, the cut lands on the nearest keyframe — leave a second of margin if you need an exact frame boundary.
How to trim video
- 1
Select your files
Drag & drop your MP4 files onto the area above, or click to browse. You can add multiple files at once for batch conversion.
- 2
Convert instantly
Set the options above and click the button. Processing runs entirely inside your browser using WebAssembly.
- 3
Download results
Download each converted MP4 file individually, or grab everything at once as a ZIP archive.
About the MP4 format
MP4 (MPEG-4 Part 14) is the universal delivery container of digital video. It wraps H.264, HEVC or AV1 video with AAC audio, and its structure — separate metadata (moov) and media atoms — is what makes streaming, seeking and fast-start playback possible. Phones, cameras, TVs, browsers and every social platform assume MP4 first.
Quality is entirely a function of the codec and bitrate chosen at encode time, so an MP4 can be a 10 Mbps HEVC master or a postage stamp. That flexibility plus total playback coverage is why nothing has displaced it in twenty years — conversion between formats almost always ends in MP4.
+ Strengths
- ✓Plays on every device and platform in existence
- ✓Streaming-ready structure (fast start, seeking)
- ✓Choice of modern codecs: H.264, HEVC, AV1
! Limitations
- −Quality depends entirely on encode settings
- −HEVC variants hit licensing gaps on some platforms
Frequently asked questions
Does trimming reduce video quality?
No. Streams are copied as-is, so video and audio keep their original quality — only the length changes.
Which video formats work?
MP4, MOV, MKV, WebM, AVI, M4V, 3GP, TS, FLV, WMV, OGV and more — the trimmed file keeps the source container.
Why is my cut slightly off from the time I entered?
Copy-mode cuts snap to the nearest keyframe. Re-encoding would be exact but far slower and would cost quality.