Take a piece out of a video — as a clip or as a looping GIF. Nothing is uploaded: your file is read and rebuilt inside this tab.
What to make
A GIF holds at most 256 colours and no sound. Fewer colours, lighter file.
The clip keeps its sound and is re-encoded as it plays, so a ten-second piece takes about ten seconds.
The video never leaves this tab: the browser itself reads it, trims it and rebuilds it. No upload, no queue, and no size limit but your own memory.