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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%

Resize video — MP4 files, without uploading

Change a clip's dimensions, starting from MP4 video — here in this tab, with nothing uploaded.

Resizing is how a clip gets small enough to send — which makes it exactly the kind of job you do not want to do by uploading the large version first.

Does this work with MP4 files?

Yes — that is what this page is set up for. MP4 is the format everything plays, and the safe answer when you are not sure.

Will it stay in proportion?

Yes unless you ask otherwise. Set one dimension and the other follows.

Can I make a video larger?

You can, but there is no detail to add — scaling up only makes the existing pixels bigger.