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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%

Trim a video without uploading it

Cut a clip down to the good part - here in this tab, with nothing uploaded.

Trimming usually means cutting something out - a face, a voice, a mistake. That is not a thing to hand to a server first.

Can I keep the middle and drop both ends?

Yes. Set a start and an end point and everything outside them is dropped.

Is the audio trimmed too?

Video exports carry no audio track yet, so a trimmed clip comes back silent. To cut the sound itself, open the file on the audio bench.

Will trimming reduce quality?

Only slightly, from the re-encode. The picture itself is not scaled or altered.