If you are using a screenshot or a PNG image, it will default to have a transparent background. If you are using a JPG or other file format, you’ll need to adjust your background color in the Snagit editor first or it will default to white rather than transparent.

Why does my PNG have a background?

With the most recent versions of iOS, when you import photos using iTunes import/sync or iCloud sync it will convert your transparent PNG file to a non-transparent JPG file. If it stays white then the image has been converted to a JPG file. …

Why do PNG files have black background?

Because the viewer that you’re using to see the file shows black as the color of transparency – or because it doesn’t support transparency. … A PNG file’s transparency layer doesn’t contain a background at all.