http://www.network-science.de/ascii/ This one exists since 1996 and allows all fonts to be rendered. Option is very far on to top of font selection drop—down.
It has numerous features for customization, such as specification for characters to be used in the art, font face, size. It mat export to text or png of the text in color. It allows you to adjust the color levels of the source image, or crop it on the fly.
It is not exactly the same type of software, as it actually generates using a source image. I use it sometimes to make gifts for friends.
Does anyone know a tool like this that doesn't send queries to the server? I know there are command-line options, but I'm looking for something like a github.io URL that has no server-side component.