This translator generates superscript (ˢᵘᵖᵉʳˢᶜʳᶦᵖᵗ) which you can copy and paste. It is actually converting your text into a subset of the Unicode standard. This is why you're able to copy and paste it around the place (e.g. facebook, tumblr, twitter, reddit, instagram etc.). It's also useful for generating exponents, for example if you're trying to submit an equation somewhere LaTeX and other formatting isn't supported.
The Unicode spec contains superscript characters for all of the numbers and letters except "i" and "q". So in this converter I've had to find the nearest characters which look like superscript versions of these.
Note that if you're posting to reddit, you can actually already do exponents/superscript by writing "x^2" which would produce x². And if you have access to HTML, then you can use the sup tag.