[Titanous]

I made a really basic PhantomJS app that runs on Heroku for this purpose: https://github.com/titanous/screenshotplz

[heliostatic]

This is fantastic! Have you given any thought to how you might support additional fonts?

[Titanous]

I think phantomjs uses system fonts, but research is warranted. It sounds like you may be able to use @font-face to inject more fonts.