Logos supplied as JPEGs always carry a white box. Removing it makes the mark usable on dark headers, merchandise mockups and video overlays.
Start from the largest version you have
Logos are line art, so any softness in the source shows badly once it is enlarged.
Cut and clean
After the automatic cutout, use the erase brush to remove any leftover fringe inside counters — the enclosed spaces in letters like O and A.
Sharpen the edges
Line art wants crisp edges. Push the sharpen slider and pull feather down to zero.
Export as PNG
Always PNG. JPEG will reintroduce the white box.
See which files you can upload in supported formats