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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?

Yes, the sound stays in step with the picture.

Will trimming reduce quality?

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