If you want to convert web page of any site as a Image then This are Best 2 sites for you to convert web page of any website to Image online free.
1. sciweavers.org
it is a best site on web to convert any web page into High Resolution Image. you dont need to Register on this site to convert web pages to image. It support image file formats like JPG ,PNG,GIF,TIF,BMP,PGM And PGM
2. convertwebpage.com
convert-webpage help you to convert page of any website to image or PDF file easily. for this you need to enter a url address of web page you want to convert on this site and get web page as a image.