Is there a universally supported format?
I'm working on a school project where people can upload books/documents for storage and indexing and then download either to pc or ebook reader.
What I'd like to know is, is there a standard or universal format I should use for the documents? I've read on here that epub seems to be becoming a great format but do all the readers support it? I've been the the manufacturer's websites and they claim to support lots but often I find people on the web complaining that PDFs don't reflow, or that format x doesn't display properly.
Should I be looking at ebook formats or should I just stick to A4 PDF?
Thanks in advance.