I occasionally need to convert the background color of a particular image to be transparent so that the image looks better on medium with backgrounds of colors other than the image’s original ...

Any Windows executable programs that display icons must use the ICO format for those icons. Icons can have transparent areas, which allows you to create icons with rounded corners or circular outlines ...

Microsoft Bing Search sometimes will show a button to see what images look like with transparent backgrounds. It shows up for searches for some company logos, where it says "see which images have ...