Due to the complex nature of PDF files, in certain situations when you change the font size, only text will appear. This is because some tables and graphics may be reformatted and altered during the reflow process. Also, in cases where PDF files are created using image data only, there is no text to reflow or resize. In these cases, if retaining the original layout of a PDF file is required, Sony recommends that you view the PDF file at its original font size.
NOTE: The Reader™ Digital Book provides the ability to display most text-based PDF files in several font sizes. Documents are displayed in the default font position with their original layouts. To view the document in a different size, use the zoom in function.