What is a Tagged PDF?
PDF 1.4 introduced "Tagged PDF".
A tagged PDF is a PDF document that contains tags. It includes a tag tree that provides assistive technologies with the structure of the PDF document. This structure helps users understand the content and reading order of the document. Each tag identifies the type of content and stores related attributes.
A properly tagged PDF is accessible to everyone. An accessible PDF makes it easier for people with disabilities to access PDF documents with assistive technology software and devices (like screen magnifiers, screen readers, speech-recognition software, text-to-speech software, etc.). PDF/UA uses Tagged PDF to ensure electronic documents are fully accessible.
A PDF document can be tagged in two main ways:
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Manual tagging
Manual tagging uses software tools. Adobe Acrobat Pro is a leading tool for tagging PDF documents. -
Auto-tagging
Some software can automatically create tagged PDFs, but this feature is not always enabled by default. Modern tools, such as Apple's office suite, automatically add tags when exporting to PDF.
