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There is no upload: The work happens in this tab. Your file never travels, so there is no copy of it anywhere but your own disk.
Nothing to delete later: Sites that upload promise to delete your file afterwards. That promise only matters because the file was theirs to hold.
It works with the Wi-Fi off: The honest test. Turn off your connection and the tools keep working, because everything they need is already here.

Drop your video hereto load the tools

Nothing is uploaded — the tools run right here

Applies to every loaded image

Look Strength 100% Brightness Contrast Saturation Vibrance Vignette

Max width Format Shape

Shape Size Across Down Border

Text Where

100%

Crop video — MKV files, without uploading

Reframe a clip to what matters, starting from MKV video — here in this tab, with nothing uploaded.

A video upload means sending hundreds of megabytes to someone else's computer and waiting. Doing it here skips both the wait and the copy.

Does this work with MKV files?

Yes — that is what this page is set up for. MKV is the archivist's container: it holds anything, but few devices play it directly.

How big a video can I work on?

There is no server limit because there is no server. Your computer's memory is the only ceiling, and it is a generous one.

Is the video re-encoded?

Yes — cropping changes the frame, so the clip is written out again when you save.