Bitmap image file can be converted into HTML due to the fact that HTML tables' cells may be colored. This online converter reads your image file, picks each pixel color one by one and then creates an HTML table with cells color accordingly to your image pixels. Such table look just as original image, but it is not a solid file any more, so it can not be saved or copied into clipboard.
Note that processing large images draws a lot of computing time and your browser may report as «frozen». Size of HTML table also increases drastically (e.g. 1000x1000 original image becomes ~48 Mb HTML table).
Also have fun enabling «mirror» switches. Oh, by the way, in order to proceed with converting, your browser must support HTML5 features such as File API, Canvas and Image API.