PDF is now a published ISO standard, titled Document management-Portable document format-Part 1: PDF 1.7Īccording to the ISO PDF standard abstract: The ISO 32000-1:2008 PDF open standard was published by the ISO on July 1, 2008. (2009) – PDF 1.7, Adobe Extension Level 5 / Acrobat 9.1.(2008) – PDF 1.7, Adobe Extension Level 3 / Acrobat 9.0.There have been nine versions of PDF with corresponding Acrobat releases: The PDF file format has changed several times and continues to evolve, as new versions of Adobe Acrobat were released. djvu format, which has had growing success and penetration in the online world for eBooks, catalogs, and image-sharing.Īdobe soon started distributing its Acrobat Reader (now Adobe Reader) program at no cost, and continued supporting the original PDF, which eventually became the de facto standard for printable documents on the web (a standard web document). In 1995, AT&T Labs commenced work on another electronic document standard targeted at libraries and archives for preserving their books and documents, DjVu. Additionally, there were competing formats such as Envoy, Common Ground Digital Paper, Farallon Replica and even Adobe's own PostScript format (.ps) in those early years, the PDF file was mainly popular in desktop publishing workflow. Adobe Acrobat, Adobe's suite for reading and creating PDFs, was not freely available early versions of PDF had no support for external hyperlinks, reducing its usefulness on the Internet the additional size of the PDF document compared to plain text meant significantly longer download times over the slower modems common at the time, and rendering the files was slow on less powerful machines. PDF's adoption in the early days of the format's history was slow. 10 Other applications and functionalities.3.4 Logical structure and accessibility.3.3.2 Adobe XML Forms Architecture (XFA).

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