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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 — FLV files, without uploading

Change a clip's dimensions, starting from FLV 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 FLV files?

Yes — that is what this page is set up for. FLV is a Flash-era container you now mostly meet when rescuing something old.

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.