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About the contributor
PDF Association

Mission Statement: To promote Open Standards-based electronic document implementations using PDF technology through education, expertise and shared experience for stakeholders worldwide.
More contributions
What is a “Competence Center”?

The PDF Association started in 2006 as the “PDF/A Competence Center”. The mission was to identify – and thereby establish – a common interpretation of the PDF/A-1 specification. With that accomplished through meetings open to all members, the secondary …

“PDF can do THAT?!”

PDF files deliver a complete package of information that defines a document; everything that’s needed to represent the text, graphics and layout that the recipient receives. To most people, PDF is “electronic paper” – the digital expression of a cellul …

The only digital document format

What is a “document”? A document is a record of some (typically written) content – a publication, a contract, a statement, a painting – at a moment in time. Until the advent of computers (and scanners), the media typically considered useable for such r …

Save the Date: PDF Days Europe 2018, May 14-16, in Berlin

PDF Days Europe is the most popular PDF event of the year. It’s where the PDF industry meets, and where institutional and corporate users come to learn what else PDF could do for them. The first two PDF Days will offer a broad range of educational sessions focussed on current and perennial topics in the world of PDF technology implementation.

The Power of the Page

It’s a question that vexes vendors of web-based solutions everywhere: why do people still insist on PDF files? And why does PDF’s mindshare keep going up? “PDF is such antediluvian technology!” they say. “It’s pre-web, are you kidding me? It’s so old-f …

Who will be first to support reading tagged PDF on mobile devices?


App store icons for PDFMobile devices are taking off worldwide. PDF technology has enormous potential in the mobile device context. The elephant in the room, however, is that although tagged PDF is an essential feature to government and large institutional PDF generators, it just isn’t yet supported on any mobile platform.

The major mobile platforms already include capable screen-readers as part of the OS. Accessibility is increasingly commodified for HTML content, but PDF gets little attention, vital though the technology is to business and governments worldwide.

Accessible PDF support on mobile devices would be a potent addition to mobile applications for digital documents, and not just in the relatively limited accessibility marketplace. There’s a world of new, and very cool, end-user products awaiting support for tagged PDF on mobile devices.

What sort of products could be developed on the basis that they worked best with PDF files that conformed to PDF/UA? There are many possibilities:

  • Dramatically superior full-text search results
  • High-quality reflow and content extraction. See callas software’s PDFgoHTML and SNAB’s VIP PDF Reader for demonstrations of such applications
  • Advanced text-to-speech conversion, including synchronized text highlighting
  • A framework for integration with voice-based annotations, digital signatures and more
  • Voice-based navigation
  • Interoperability with publishing or Product Lifecycle Management (PLM) systems
  • And coming soon, support for mapping third-party schemas such as MathML and DAISY to PDF tags

There are concrete consequences for the present-day lack of support. The government of Australia is using this fact to stand by it’s earlier decision that PDF was insufficient to meet accessibility needs. In it’s most recent update on the matter last November, it said:

…the Review also determined that the technical support in the mobile environment was insufficient to claim WCAG 2.0 conformance. Testing of Voiceover (iOS) and Talkback (Android) did not reveal the semantic information from a tagged PDF and bookmark navigation of the document was not available on mobile platforms.

As a result, PDF does not yet have the required accessibility support to fully claim WCAG 2.0 conformance, so it cannot be solely relied upon for the provision of government information except in limited circumstances.
Australian federal government, November 18, 2014

There’s been some level of support for tagged PDF in desktop screen-readers for over 10 years. It’s been over six years since publication of ISO 32000, over two years since the publication of ISO 14289 (PDF/UA). While libraries and applications for creating tagged PDF abound, full access to PDF on mobile devices remains unattained, and therefore, so do many other interesting possibilities for features, all enabled by tagged PDF.

Who will be first to deliver accessibility technology for iOS or Android that supports the accessibility model in PDF?


Tags: DAISY, MathML, PLM, WCAG 2.0, accessibility, mobile
Categories: Government, PDF/UA