I read most non-mathematical text in epub (usually converted from something else) because, as you say, it is better. But there is no tool support for making goo

I read most non-mathematical text in epub (usually converted from something else) because, as you say, it is better. But there is no tool support for making good epubs of math text, so I still need PDFs. When I have LaTeX source for what I read, I just compile with appropriate margin settings.