Convert PDF to specific size and file format

What is your objective here? What are you trying to do?

Yes, there are a variety of formats that a PDF can be converted to (see below), but each has its own advantages and disadvantages. As far as trying to get any given PDF down to a specific file size, there are obstacles. For example, if the PDF is filled with images, there's only so far you can reduce the final size as images take up a lot of storage space.

BTW, just so you know, Acrobat Pro provides the most capabilities, but Acrobat Reader provides none essentially. Reader provides the ability to read PDFs, fill in forms, make comments, and a few other basic capabilities.