Which image format is best for which use? It’s not always easy to figure that out, but this handy guide can help you with that decision:
Link: JPG, PNG or GIF: How to Choose an Image Format for Screenshots.
You may use the good-old Print Screen key or any of the professional screen capture tools to grab your desktop but the basic requirement remains same – the output image should be sharp and that the file size be well within a reasonable limit. Now PNG, JPG and GIF are the three most popular image formats for sharing screen captures on the web
