YouTube Video Trimmer — Free, Online, No Upload
Already downloaded the YouTube clip? This trimmer cuts it frame-accurately in your browser — perfect for clipping highlights, tutorials, or reaction reels without sending the video anywhere.
Drag & drop your video here, or click to browse
Max file size: ~2 GB (memory permitting)
Why use this YouTube Video Trimmer?
- Frame-accurate trimming via FFmpeg keyframe seek — no awkward 1-second snaps.
- Stream-copy mode means no re-encoding; quality stays bit-identical to the YouTube source.
- No upload — your downloaded clips stay on your device, no copyright limbo.
- Output stays MP4 / WebM / whatever the source was — works in any video editor afterward.
How to use it
Download the YouTube video first
Use any browser extension or yt-dlp locally — we don't fetch from URLs to keep your browsing private.
Drop the file into the trimmer
MP4 and WebM (the two formats YouTube serves) both work without re-encoding.
Set start / end and download
Pick your clip range with the timeline scrubber. Hit "Trim" and download the result instantly.
What to watch out for
| The download is the hard part | This tool cannot fetch a URL, so you need the file first. That is a deliberate limit: fetching someone else's video server-side is what gets those sites taken down. |
|---|---|
| Check what you actually downloaded | yt-dlp and most extensions hand back VP9 or AV1 in a WebM by default. Trimming is lossless either way here, but the result will not import into some editors. |
| Trim points snap to keyframes | A lossless trim can only cut where the video has a keyframe, so the start may land up to a few seconds early. Re-encode if you need the exact frame. |
| Long videos are memory, not time | An hour of 1080p is several gigabytes in the tab. Trimming a short section out of a long download is the case most likely to run the browser out of memory. |
FAQ
Can I trim a YouTube video without downloading it first?
No — YouTube does not allow direct trimming via API. You need a local copy of the file. Once it is on your device, this trimmer does the rest in seconds.
Will trimming reduce quality?
No. The trimmer uses stream-copy (-c copy), so the output is bit-identical to the YouTube source between your chosen start and end points.
Does this run in my browser?
Yes — the tool uses FFmpeg compiled to WebAssembly. Your file never uploads to a server, never leaves your device, and there is no signup or watermark.