Is PDF Accessible?
Support for PDF accessibility dates back to 2001.
The PDF specification provides robust support for accessibility. The accessibility of any individual PDF file depends upon how well the author prepared the file for accessibility, and the accessibility of the experience for the end user depends on how well the PDF viewer application supports the accessibility features in the specification.
Adobe Reader takes advantage of all attributes of PDF files that have been properly prepared for accessibility. Familiar accessibility features found in formats like HTML such as alternative text for images, semantic elements to convey relationships and structure, labels for form controls, headings for tabular data, and a meaningful and logical content sequence are all fully supported by the PDF specification. Users of popular assistive technologies such as NVDA, JAWS, VoiceOver, ZoomText, SuperNova, MAGic, and more are able to use their tool of choice and access information contained in PDF files.
In addition to support by assistive technologies, Adobe Reader also provides support for critical accessibility features such as text enlargement, text reflow, high-contrast viewing, as well as providing rich support for keyboard-only access for users who are unable to use a mouse.
An Overview of PDF Accessibility is available which provides general information about features of PDF which support accessibility.