PDF Specification Table

PDF Specification Version: 1.2 1.3 1.4 1.5 1.6
Number of pages (2005): 390 696 978 1172 1236

The table above shows five different versions of Adobe's Portable Document Format (PDF). Each was released with its own software package; however, Adobe has relinquished control of PDF 1.7 and any future versions to ISO, who confirmed it in 2008 as an international standard (ISO 32000-1).