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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 — WebM files, without uploading

Burn captions into a clip, starting from WebM video — 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.

Does this work with WebM files?

Yes — that is what this page is set up for. WebM is small and made for the web, though older players and editors ignore it.

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.