GIMP: Create A White Circle Over A Transparent Background For Video Editing.
How to create a round white circle over a clear background. A Gimp beginners tutorial.
GIMP (GNU Image Manipulation Program) is a free and open-source raster graphics editor used for image retouching and editing, free-form drawing, converting between different image formats, and more specialized tasks.
GIMP is released under GPLv3+ licenses and is available for Linux, macOS, and Microsoft Windows.