Show HN: My sideproject - The javascript is free, but the backend will cost you.

Hi all, My side project, an online image watermarking app, is ready to start showing people, so I'd appreciate your feedback.<p>http://www.watermarquee.com<p>The free version is entirely client-side javascript. If there is a good response, I plan to develop the backend to support larger images and additional file types, as well as some other functionality. Since the free version is completely client-side, I can easily host if on Heroku's Varnish cache, which makes this an easy/cheap MVP to try out. Please let me know what you think.