GIMP (free) or Paint.NET (free).
: Utilize search engines like Google, Bing, etc., and enter specific keywords such as "free bmp badges," "bmp icon badges," or "download bmp badges." This should help you find relevant sources. bmp badge download
If you need to design a badge from scratch for internal documentation, you can use specialized utilities. How to Claim Your Digital Badge—and Why (updated) GIMP (free) or Paint