I think, I'm not going to monetize it.

Your UI is a logo and a URL submission box.

PDFMYURL's UI is a logo, a submission box, a 'bookmarklet', and (optionally) a description of their API.

How is yours better?

its just the way you are prompting the download. Even IE blocks it. However it still shows the download. Many sites do this same thing just w/e code your using is not the correct way. 1 day you will learn that Opera is better :) Give it time.

Maybe I will do this in future :)

Thanks for review! I think about it..