I am assuming you are making a file for people to download from a website, because a PDF can't technically be "viewed on the internet." Although most modern browsers will just open a PDF file in place, they are not like a GIF, JPG or PNG that can be embedded in an html file.
One more thing: when saving it as a pdf, in the pdf settings choose SMALLEST FILE SIZE. That will save it in 72ppi and will let you view the whole page on the screen (since monitors display at 72ppi). If you save in higher resolution, you won't be able to view the whole page at once.