PDF/UA, defined in ISO 14289-1, is the specification intended for improving the accessibility of PDF based on the ISO 32000-1 (PDF 1.7) specification. ISO 14289-1 defines separate requirements for the PDF file format, behaviour of a conforming reader, and behaviour of Assistive Technology (AT) devices. Only the file format requirements are in scope for this paper.

The main features of PDF/UA file format requirements are: