Open the JPG image in PicShrink Image Compressor. Go to the “Output Format” Tab and Select PNG. Then press the Start button.
The window “Output images” will appear, where you can choose the location you want to save the converted file to. The default location will be your desktop (a folder named “shrinked Pictures” will automatically appear. Press OK to finally convert the image.
Watch this video showing step by step how to do it: