James, I do have a Wordpress site but - The images turn out ENORMOUS no matter what I try if I use that .url. The Pinterest thing was just something I tried out of frustration and lo and behold, it works! Just pick the smaller-sized file option they give you on your page.

:- )

OH PS - Don't copy the Pinterest .url from the browser bar, instead, right click and copy url from actual image posted on Pinterest - Then it will show up here when pasted in the 'Enter an Image' button. Sorry, forgot to mention that step.