Portable Document Format created by Adobe for their Acrobat products. Website PUSAT BOLA Terpercaya . This is indirectly the format used for document exchange. Software support for this format covers almost all computer platforms and handheld devices. devices some have problems with PDF because most of the available content will be displayed either in letter or A4 format, both of which are not easy to read when scaled down to fit the small screen. Some digital book reader applications can rearrange the appearance of several PDF documents, including the Sony PRS505, to accommodate the small screen. Some digital book reader applications, including Iliad IREX, have pan-and-zoom features that help to read easily.