Crop video
Cut a rectangle out of the frame. Numeric crop, like the image tool.
Runs in this tab. The file stays here.
This runs in your browser. Nothing is uploaded. Longer clips take longer here than they would on a fast server — that is the trade-off for not sending the file.
About Crop video
Crops a rectangle out of a clip with FFmpeg in the browser. Numeric X/Y/width/height, same idea as the image crop tool.
There is no drag box on the video, same as image crop on this site. Type even numbers; H.264 wants even dimensions. If you type a crop past the edge, FFmpeg will error and the page will say so.
Crop video runs FFmpeg compiled to WebAssembly in this tab. The first visit of a video or audio tool fetches about 30 MB from this origin; after that it can stay cached. Your file is not in that download and is not POSTed anywhere. GPL FFmpeg, single-thread, same origin, no COEP experiment. That is the same encoder as convert, trim, and compress — this page is just a different argument list, with the same honesty about what the core cannot mux.
You can open the network panel and watch. Encoding a long clip on a phone is slow because it is your CPU. That wait is the trade for not handing the file to a converter you found in a search ad. Reverse and boomerang cap duration so a two-hour file does not try to live backwards in RAM. If a codec inside a familiar extension is missing from this core, you get an error rather than a silent broken file. Subtitle generation and stem splitting are not here; I will not pretend they are. Missing is better than a watermarked demo.
How to use Crop video
- 1Drop a clip.
- 2Set X, Y, width, and height.
- 3Click Crop, then download.
What it won't do
- No drag handle.
- Re-encodes the cropped region.
Common questions
Can I drag a crop box on the video?
Not on this page. Image crop is numeric too. A pretty overlay is a later tool, not a fake one.
Does crop video upload the file?
No. Local encode.
Why even numbers?
H.264 and VP8 are fussy about odd widths. The encoder rounds down to even.
Related tools
Why this one doesn't upload your file
There is no server to upload to. This page is a static file, and the work happens in your browser using the same graphics and WebAssembly code that renders every other site you visit. Your file is read from disk into memory, processed, and handed back as a download. Once the page has loaded you can disconnect from the network entirely and it keeps working. The longer explanation