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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

Colours 6 Detail 1 Smooth curves

Shape Size Across Down Border

Text Where

100%

Change video speed - FLV files, without uploading

Speed a clip up or slow it down, starting from FLV video - here in this tab, with nothing uploaded.

Speed changes are quick to describe and slow to upload. This one skips the upload.

Does this work with FLV files?

Yes - that is what this page is set up for. FLV is a Flash-era container you now mostly meet when rescuing something old.

What happens to the audio?

It is retimed with the picture and keeps its pitch, so a sped-up voice does not turn into a chipmunk and a slowed one does not drop an octave.

How slow can I go?

Slowing down repeats frames rather than inventing them, so past about half speed it starts to look stepped.