In my first image (PNG), the edge around the picture has more clean pixels than the others. For the second image, the transparency is now white and a little low on quality. The one with less quality is the last one (Gif) that has pixel edges around the bird. Overall, all three images are similar in color and size. Gif has compressed more with the image. JPG has become a solid square image. PNG makes the transparency clean and compressed.
Software: Photopea/ Tools Used: Lasso Tool with Similar option tab./ In addition to masking the background transparency.