For example a PDF file might look like it has text in it while in fact the PDF is displaying images (pictures) that contains text. Not all PDF files contain all of the types of data and some PDF files are different from what they seem. PDFs can also contain links and buttons, form fields, audio, video, and business logic. These include Text, Raster Graphics, Vector Graphics ( SVG), Fonts (Glyphs), and meta data. A half A size works well to display on most devices and can be printed using 2 pages per paper sheet in landscape mode.Ī PDF file may contain several types of data. While a PDF is always arranged by pages there is no reason that a better aspect ratio or smaller size cannot be generated when targeting an electronic device. Most portable devices do not have screens nearly this big so they will often shrink the page to the point of not being readable or zoom in to just part of the page causing the reader to pan the page around to try and read it.

To display such a page on a computer or eBook screen at full size would require a 14' or larger screen display. Since PDF is designed for printing it is generally defaulted to letter size for US documents and A4 for Europe (See Paper sizes).

The standard does not encompass all versions or all capabilities. Since it was designed as a print format it specifies the size of the paper that is needed to reproduce (render) the original. Initially PDF was designed as a print format similar to PostScript and even today it is often used to exchange data that will be printed.

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