Funny you should ask. I just needed to do that myself. It's not free, but the trial allowed me to use it enough to get done what I needed to do: http://anydwg.com/dwg2pdf/
I actually develop a program that does that. It's not free, though, but there's a fully functional 15-day trial. www.autoimager.com if interested.
I know a tool that can save your problem easily, and you can have a try,and I aslo know that it is free to download. But I do't remember it right now so I will tell you sonner.
I asked my friend last night, and he told me the tool what I had told you if you are interested in it, you can have a try if not it is ok. dgntodwgconverter.net/dwg-to-pdf-converter.html and another one you requested is dgntodwgconverter.net/dwg-to-jpg-converter.html Hope I did some help to you.