Compare two images based on visual characteristics. HTML5 and JavaScript must be supported by your browser, and the scaling algorithm used by the browser will affect the result.

Enter the URLs of two images from 01101001.net, nasa.gov or usgs.gov:

Image URL 1: Image URL 2:

Please note that this page requires HTML5 and JavaScript.

Thanks to Dr. Neal Krawetz for the algorithm which inspired this algorithm.