Portable Document Format (PDF) is considered one of the most reliable formats for communication because of its immense security. While Adobe has always provided free ...

Charles 'Chuck' Geschke — the co-founder of the major software company Adobe Inc who helped develop Portable Document Format technology, or PDFs — has died at age 81. Charles Geschke's first Adobe ...

The best free PDF reader apps do more than just act as a PDF viewer - any modern browser can do that. What I'm looking for is tools that go beyond that, offering commenting, collaboration, and ...