With the GdPicture.NET PDF SDK you can generate tagged and accessible PDFs from scratch. Be careful, not all tagged PDFs can be considered accessible.
The PDF/UA standard describes the technical specifications to generate and validate fully accessible and ISO compliant PDF files.
Tags are structural elements of the PDF that describe the document’s logic.
According to the PDF specification, “it defines a set of standard structure types and attributes that allow page content (text, graphics and images, as well as annotations and form fields) to be extracted and reused for other purposes.”
The logical structure of the document consists of the organization of the document into chapters and sections.
Special elements such as figures, tables, and footnotes are also mentioned.
Tags can hold supplementary information about images, figures, tables, like their titles, or some useful descriptive text.
They can store information about sections, paragraphs, like their heading, naming, as well as their font size or font style.
They also allow distinguishing between the real page content and some graphical items not relevant to the contained information.
ISO 14289 describes the technical specifications for creating, viewing, and using accessible PDF files, for publishers of PDF software and assistive technology. It also lists validation elements for PDF/UA compliance.
Accessibility is a social necessity for people with disabilities and a legal necessity in many countries.
PDF/UA is compatible with long-term archiving (PDF/A).
As it is difficult to say if a PDF is accessible just by looking at it, it is necessary to make some tests to validate the PDF/UA conformance.
There are two types of tests:
The GdPicture methods to tag and generate accessible PDFs:
You will find a compiled demo applications in
You will be able to find C# and VB.NET demo applications including source code in
You will find other code snippets within the online reference guide found here
You can find some discussions about PDF in the dedicated section of our community forums located here
PDF dedicated forum