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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%

Apply a filter to video without uploading it

Grade and colour a clip — here in this tab, with nothing uploaded.

Colour work means watching the footage back repeatedly. Doing that over an upload is slow; doing it here is immediate.

Which looks are included?

Black and white, warm, cool, faded and teal-and-orange, each adjustable rather than all-or-nothing.

Can I adjust brightness and contrast by hand?

Yes, alongside saturation and vibrance.

Are these real LUTs?

Yes — the same colour lookup tables an editor would use, applied here in the tab.