Adobe® Acrobat® software addresses the needs of both users with disabilities and authors of accessible content. The new features and enhancements and free Adobe Reader® software enable users with disabilities to access, read, and use Adobe PDF documents and forms across multiple languages more easily. And the improved tools for generating, reviewing, and enhancing PDF files available in the Acrobat family make it easier than ever for authors to create and distribute electronic content that is optimized for accessibility.
Although Adobe Acrobat Standard software provides some functionality for making existing PDF files accessible, only Adobe Acrobat Pro software can perform certain tasks — such as editing reading order or document structure tags — that may be necessary to make some PDF documents and forms accessible. You cannot use Adobe Reader to make PDF files accessible, but users can export a plain text version of a PDF file using Adobe Reader.
The accessibility of any individual PDF file depends upon how well the author prepared the file for accessibility. Adobe Reader takes advantage of all attributes of PDF files that have been properly prepared for accessibility. Better quality content results in a more satisfactory reading experience.
Adobe Reader attempts to compensate for certain shortcomings in PDF files that have not been properly prepared for accessibility. For example, it temporarily tags an untagged PDF file so that users of assistive technology such as screen readers can read as much of the content as possible.
Additionally, Adobe Reader has the built-in accessibility features available in Acrobat:
Adobe Reader X, however, does not have the accessibility authoring tools included in Acrobat X. For example, it cannot perform optical character recognition (OCR) conversions, nor can it add missing alternate text descriptions to graphics in PDF files.
The first step in making scanned documents accessible is to perform Optical Character Recognition, or OCR, on the scanned page image. OCR converts images of alphanumeric characters into actual text that can be searched, read by assistive technology, exported to other formats or copied and pasted into other applications. Acrobat has OCR text recognition feature that allows you to apply OCR to the scanned pages.
The resulting PDF files contain computer-generated text, which is necessary for making the file's information accessible via screen readers and other assistive technologies. You may need to further process the files at this point by using the accessibility authoring tools in Acrobat to add structure (tags), alternate text for graphics that appear in the file, and accessible form fields if applicable. You may also need to adjust the reading and tab order for interactive PDF file components.
Acrobat offers a number of options for creating accessible, interactive PDF forms. The form tools in Acrobat Pro allow you to automatically recognize form fields in PDF files and Microsoft Word documents. Acrobat form tools can create accessible interactive PDF forms. You can also use Adobe LiveCycle® Designer ES software, a point-and-click graphical form design tool that simplifies the creation of forms and that is included with Acrobat Pro. Forms and documents that are created in LiveCycle Designer ES can be merged with business data and rendered as a number of accessible file types, including PDF, HTML, and SWF.
The ability to tag PDF documents is part of the PDF specification that allows PDF files to contain logical document structure such as headings, figures, and paragraphs. Tagged PDF files include complete logical structure plus additional information about a document's contents that substantially increase accessibility.
Some accessibility benefits of tagged PDF files include:
Acrobat and Reader were created with the regulations in Section 508 of the U.S. Rehabilitation Act of 1998 in mind. To help government customers determine their own compliance, Adobe has prepared a document called the Voluntary Product Accessibility Template (VPAT) that details Acrobat and Reader accessibility features in the context of Section 508 guidelines. This compliance statement applies to the two applications, not to the compliance of specific PDF files, which must be evaluated on a case-by-case basis.
If you want to make your documents more accessible to people with disabilities, you can use the Accessibility Checker to help you evaluate the accessibility of your documents and identify areas that may be in conflict with Adobe's interpretations of the referenced guidelines. Adobe Acrobat XI Pro includes a new Make Accessible Action which guides authors through key steps in creating and verifying an accessible PDF. It will help you add tags, tag content as headings, paragraphs, or images, add descriptions of images and charts, and more.
However, the Accessibility Checker does not check all accessibility guidelines and criteria, including those in such referenced guidelines, and Adobe does not warrant that your documents will comply with any specific guidelines or regulations. Please consult with your legal counsel for guidance on compliance with the referenced guidelines or any other accessibility guidelines.
Several tools can create tagged PDF files automatically, including:
However, this is not entirely an automatic process. Creating an accessible electronic document requires using both the right tools and proper authoring techniques. Software applications geared toward accessible content retain and encode document content and structure and deliver that information effectively for use by assistive technologies.
Authors must also create documents with accessibility in mind. They need to:
You may still need to review the results in Acrobat when transforming source files into PDF.
Acrobat provides all of the capabilities you need through a variety of functions, including the Accessibility Checker, Tags palette, and Recognize Text feature, to help ensure that the accessibility encoding available in the source application is successfully translated into PDF.
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If you have questions or comments or want to get involved with Adobe’s accessibility efforts, contact us. We welcome your feedback.