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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%

Add subtitles to video without uploading it

Burn captions into a clip — here in this tab, with nothing uploaded.

Subtitles usually contain every word said in the video, written down. That is a transcript — not something to hand to a free website.

Which subtitle files work?

SRT and VTT, the two you are most likely to already have.

Burned in or a separate track?

Burned in means they always show and cannot be turned off. A separate track can be switched off but only works in players that look for it.

Can I change the font and size?

Yes — size, colour, and the shadow that keeps them readable over bright footage.