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Line 58: In April 2023 the PDF Association made ISO 32000-2 available for download free of charge.<ref name=nowfree>{{cite press release\| title=Announcing no-cost access to the latest PDF standard: ISO 32000-2 (PDF 2.0)\| publisher=PDF Association\| url=https://pdfa.org/sponsored-standards\| date=16 June 2023\| orig-date=Updated; originally published 5 April 2023\| access-date=October 6, 2023\| archive-date=September 23, 2023\| archive-url=https://web.archive.org/web/20230923202322/https://pdfa.org/sponsored-standards/\| url-status=live}}</ref> == ~~{{Anchor\|Technical foundations}}~~Technical details == A PDF file is often a combination of [[vector graphics]], text, and [[bitmap graphics]]. The basic types of content in a PDF are: Line 92: * A loss of flexibility, and limitation to a single use case.{{citation needed\|date=December 2023}} * A (sometimes much) larger file size.<ref>{{cite web \|last1=Anton Ertl \|first1=Martin \|title=What is the PDF format good for? \|url=https://www.complang.tuwien.ac.at/anton/why-not-pdf.html \|website=~~www.~~complang.tuwien.ac.at \|publisher=Vienna University of Technology \|access-date=8 April 2024\|archive-url=https://web.archive.org/web/20240404031526/https://www.complang.tuwien.ac.at/anton/why-not-pdf.html\|archive-date=4 April 2024\|url-status=live}}</ref> PDF since v1.6 supports embedding of interactive 3D documents: 3D drawings can be embedded using [[U3D]] or [[PRC (file format)\|PRC]] and various other data formats.<ref name="3d#1">{{cite web \|url=https://www.adobe.com/manufacturing/resources/3dformats/ \|title=3D supported formats \|publisher=Adobe Systems Inc. \|date=July 14, 2009 \|access-date=February 21, 2010 Line 130: There are two layouts to the PDF files: non-linearized (not "optimized") and linearized ("optimized"). Non-linearized PDF files can be smaller than their linear counterparts, though they are slower to access because portions of the data required to assemble pages of the document are scattered throughout the PDF file. Linearized PDF files (also called "optimized" or "web optimized" PDF files) are constructed in a manner that enables them to be read in a Web browser plugin without waiting for the entire file to download, since all objects required for the first page to display are optimally organized at the start of the file.<ref name="pdf-ref">{{cite web\|url=https://www.adobe.com/devnet/pdf/pdf_reference.html\|title=Adobe Developer Connection: PDF Reference and Adobe Extensions to the PDF Specification\|publisher=Adobe Systems Inc.\|access-date=December 13, 2010\|url-status=dead\|archive-url=https://web.archive.org/web/20061115132507/https://www.adobe.com/devnet/pdf/pdf_reference.html\|archive-date=November 15, 2006}}</ref> PDF files may be optimized using [[Adobe Acrobat]] software or [[QPDF]]. Page dimensions are not limited by the format itself. However, Adobe Acrobat imposes a limit of 15 million by 15 million inches, or 225 trillion in<sup>2</sup> (145,161 km<sup>2</sup>).<ref name="pdf-ref-1.7" />{{rp\|1129}} == Imaging model == Line 194: == Additional features == === Logical structure and accessibility<span class="anchor" id="Tagged PDF"></span> === {{See also\|PDF/A-1\|PDF/UA}} A "'''tagged" PDF'''<!--boldface per [[WP:R#PLA]]--> (see clause 14.8 in ISO 32000) includes document structure and semantics information to enable reliable text extraction and [[accessibility]].<ref>{{cite web \|title=Tagged PDF Best Practice Guide: Syntax \|url=https://pdfa.org/wp-content/uploads/2019/06/TaggedPDFBestPracticeGuideSyntax.pdf \|website=pdfa.org \|publisher=[[PDF Association]] \|date=June 2019 \|access-date=2024-06-24}}</ref> Technically speaking, tagged PDF is a stylized use of the format that builds on the logical structure framework introduced in PDF 1.3. Tagged PDF defines a set of standard structure types and attributes that allow page content (text, graphics, and images) to be extracted and reused for other purposes.<ref>{{cite web\|first=Duff\|last=Johnson\|date=April 22, 2004\|title=What is Tagged PDF?\|url=https://www.talkingpdf.org/what-is-tagged-pdf/\|url-status=live\|archive-url=https://web.archive.org/web/20040807132851/http://www.planetpdf.com/enterprise/article.asp?ContentID=6067\|archive-date=August 7, 2004}}</ref> Tagged PDF is not required in situations where a PDF file is intended only for print. Since the feature is optional, and since the rules for ~~Tagged~~tagged PDF were relatively vague in ISO 32000-1, support for tagged PDF among consuming devices, including [[assistive technology]] (AT), is uneven as of 2021.<ref>{{Cite web\|title=Is PDF accessible?\|website=DO-IT - Disabilities, Opportunities, Internetworking, and Technology\|publisher=University of Washington\|date=October 4, 2022\|url=https://www.washington.edu/doit/pdf-accessible?1002=\|access-date=January 12, 2023\|archive-date=February 10, 2023\|archive-url=https://web.archive.org/web/20230210114239/https://www.washington.edu/doit/pdf-accessible?1002=\|url-status=live}}</ref> ISO 32000-2, however, includes an improved discussion of tagged PDF which is anticipated to facilitate further adoption. An ISO-standardized subset of PDF specifically targeted at accessibility, [[PDF/UA]], was first published in 2012. Line 378 ⟶ 379: * [https://pdfa.org/ PDF Association] – The PDF Association is the industry association for software developers producing or processing PDF files. ** [https://pdfa.org/resource/pdf-specification-index/ PDF Specification Index] at the PDF Association * Free [https://pdftopng.org/ PDF to PNG Converter] in high quality * {{webarchive \|url=https://web.archive.org/web/20101007220449/http://partners.adobe.com/public/developer/tips/topic_tip31.html \|title=Adobe PDF 101: Summary of PDF}} * {{webarchive \|url=https://web.archive.org/web/20160413212438/https://www.adobe.com/print/features/psvspdf/ \|title=Adobe: PostScript vs. PDF}} – Official introductory comparison of PS, EPS vs. PDF.