A-PDF PPT to PDF (http://a-pdf.com/powerpoint-to-pdf/index.htm ) is a professional and simple application which allows you to batch converting PPT to PDF. It provides you the most satisfactory service. There is no doubt that you can customize your output PDF files, including changing the page size. For more: http://a-pdf.com/faq/index.php?title=can-i-change-the-page-size-while-converting-ppt-to-pdf-with-a-pdf-ppt-to-pdf .