Compiling documents online
I can only use email to ask my mathematics teacher questions and that can be very unhandy. So I'm wondering if there is a site in which you can just basically paste a text written in LaTeX which then shows it as it would in LaTeX. Like a kind of google translate, but except for translating it shows the text in LaTeX. So I can mail me teacher a text in LaTeX and ask him to paste it on that site. With 'written in LaTeX' I mean just like in Math stack exchange, with dollar signs and such.
ps - you may edit the title and tags, since I don't know a proper tags/title for this question