![]() The older software will ignore the newer features and may not be able to display page elements that use them. Backward compatibility is also pretty good: a recent PDF 1.7 file can be opened by Acrobat 4. Overall the PDF file format is remarkably flexible: obviously it is forward compatible, allowing you to open an old PDF 1.0 file in the latest version of the Adobe Reader. A more elaborate overview of the history of PDF can be found here. ![]() For each PDF version, the new features are listed. This page lists all the major releases, starting from PDF 1.0 which was released in 1993. Over the years the Portable Document Format has evolved enormously.
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