Because PDFs don't rely on the software that created them, nor on any particular operating system or hardware, they look the same no matter what device they're opened on.
Ebe ọ bụ na PDF adịghị adabere na ngwanrọ nke kere ha, ma ọ bụ na sistemụ ọ bụla ma ọ bụ ngwaike , ha na-ele ya anya n'agbanyeghị ihe ngwaọrụ ha meghere.