Editing PDF (section)

=== 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 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.