Improved color support – both the CMYK color space and spot colors can be used.Multimedia features – adding interactive page elements such as mouse events and support for additional multimedia types.Forms – allow users to add data to a PDF or use a PDF as an electronic form.Device-independent color – PDF 1.0 only supported RGB, which left quite some room for improvement.Security features- protect PDF files by a password.Article threads – articles that span multiple columns or pages are linked so that readers can easily navigate the text.External links – embed a link to external documents or URLs.Matching software: Adobe Acrobat 1.0 PDF 1.1 PDF 1.0Īvailability: November 1992 (announcement)/June 1993 (first software) 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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