Adobe's PDF filetype was introduced to the world in January 1993. It started life as the Camelot Project in 1990, taking influence from 1985's Postscript, one of the best desktop publishing software back then. The PDF filetype was created by Dr John Warnock, Adobe co-founder, who said at the time, "These documents should be viewable on any display and should be printable on any modern printers. If this problem can be solved, then the fundamental way people work will change." With 2023 marking the 30th birthday for the ubiquitous format, we charted the fascinating history in 30 years of PDF: The file format that changed the world.