Black turns transparent — for white logos, neon and dark-layout graphics.
A black backing is the standard for light logos and effects. Threshold-based black removal produces a clean alpha channel without halos, with semi-tones fading smoothly.
White logos and neon effects often arrive on a black backing. Removing it gives you an element that sits on any background.
Fully black ones become transparent — that's thresholding. For photos use the neural “Remove background”.
Yes — server-side processing without neural nets, so limits are generous.