Trim Video
Trim Video lets you cut a clip down to a single start and end point — perfect for grabbing the best few seconds of a longer recording or removing dead air at the top and tail. Everything happens in your browser using FFmpeg.wasm, so your footage never gets uploaded and the trim is ready to download in seconds.
Add your video
The file is read by your browser and stays on your device — there is no upload step.
Your video
The work runs in this tab. Nothing is sent anywhere, and the download is generated locally.
How to use Trim Video
- 01Upload
Add your video
Drag an MP4, MOV, WEBM, MKV or AVI file onto the page, or click to browse. It loads straight into the editor — no upload.
- 02Customize
Set the range
Drag the two handles on the timeline, or type exact start and end timecodes, to keep only the part you want.
- 03Process
Export
Choose a format, add optional fades, and export. Your trimmed clip downloads straight to your device.
Which part is going?
Three different jobs that people all call trimming. Picking the right one saves doing it twice.
- Dead air at the start and endTrim Video
- A section out of the middleCut Video
- One recording into several clipsSplit Video
- The edges of the picture, not the timelineCrop Video
Where the cut actually lands
Video is not cut frame by frame in the way a picture is cut pixel by pixel.
Compressed video stores occasional complete frames and describes everything between them as differences. A cut can only be exact where a complete frame exists, so a requested time may land a fraction early.
Cutting on a keyframe can copy the stream through untouched, which is instant and lossless. Cutting to the exact frame requires re-encoding that section. Precision costs a re-encode; speed costs precision.
What you remove does not come back
The material outside your in and out points is not in the exported file. Keep the source if there is any chance you will want a longer version later.
Export to a new file and keep the source. Every tool here works from the file you drop in and writes a fresh one, so the original on your device is untouched — but only if you do not overwrite it yourself afterwards.
Supported formats
- MP4
- MOV
- WebM
- AVI
- MKV
- Maximum file size —
- bounded by your device's memory
- Processed by —
- FFmpeg (WebAssembly), on your device
Your file, and what the page does
Your file is never uploaded. Trim Video reads it into this browser tab and processes it with FFmpeg compiled to WebAssembly on your own device. There is no upload endpoint in the application and no copy on any server — closing the tab discards it.
That is also why processing takes longer here than on a site that uploads: your device is doing the work rather than a rack of servers. The trade is that the file never leaves it.
What the page does send or fetch
- The processing engine, once
- The first time you use any video or audio tool, the browser downloads the FFmpeg WebAssembly build (~30MB) from the jsDelivr CDN and reuses the cached copy afterwards. That is a file coming to you — no part of your own file is in the request.
- Ads on the page
- The site is funded by advertising, so the page loads Google AdSense. That carries the usual web basics — IP address, browser, referring page — as on any ad-supported site.
- An anonymous usage counter
- When Trim Video finishes we record that the tool ran, whether it succeeded and how long it took. No file data, no identifier, no cookie.
Your file is not on that list. How this works.
Frequently asked questions
Only minimally. Where the cut points allow, we keep the original stream; otherwise the clip is re-encoded once at high quality.
MP4, MOV, WEBM, MKV and AVI are all supported as input, with MP4, MOV or WEBM available as output.
There is no fixed cap. Files up to around 250MB are comfortable on most machines; beyond that you are limited by your device's memory, since the clip is decoded in the browser.
Yes — Trim Video is completely free. There's no account, sign-up, watermark or limit.
No. It runs in any modern browser — Chrome, Edge, Safari, Firefox, Brave — with nothing to download or install.
Not sure trimming is what you need?
- Only the middle should goCut Video
- You need several separate clipsSplit Video
- It is the file size that is the problemCompress Video
- Only the sound mattersExtract Audio
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