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Adobe ACROBAT X STANDARD Manual

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USING ACROBAT X STANDARD
Accessibility, tags, and reflow
Last updated 10/11/2011
Acrobat Standard provides some functionality for making existing PDFs accessible. Acrobat Pro enables you to
perform tasks, such as editing reading order or editing document structure tags that are necessary to make some PDF
documents and forms accessible.
Additional resources
For more information about accessibility features, see these resources:
• Acrobat accessibility, overview, new features, and FAQ: www.adobe.com/accessibility/products/acrobat/
• Information and news about accessibility in Adobe products: blogs.adobe.com/accessibility/pdf/
• Creating accessible PDF documents: www.adobe.com/accessibility
• General accessibility tips: acrobatusers.com/forums/aucbb/
About accessible PDFs
Accessible PDFs have the following characteristics.
Searchable text
A document that consists of scanned images of text is inherently inaccessible because the content of the document is
images, not searchable text. Assistive software cannot read or extract the words, users cannot select or edit the text, and
you cannot manipulate the PDF for accessibility. Convert the scanned images of text to searchable text using optical
character recognition (OCR) before you can use other accessibility features with the document.
Fonts that allow characters to be extracted to text
The fonts in an accessible PDF must contain enough information for Acrobat to extract all of the characters to text for
purposes other than displaying text on the screen. Acrobat extracts characters to Unicode text when you read a PDF
with a screen reader or the Read Out Loud feature. Acrobat also extracts characters to Unicode when you save as text
for a braille printer. This extraction fails if Acrobat cannot determine how to map the font to Unicode characters.
Reading order and document structure tags
To read a document’s text and present it in a way that makes sense to the user, a screen reader or other text-to-speech
tool requires a structured document. Document structure tags in a PDF define the reading order and identify headings,
paragraphs, sections, tables, and other page elements.
Interactive form fields
Some PDFs contain forms that a person is to fill out using a computer. To be accessible, form fields must be interactive
to let the user enter values into the form fields.
Navigational aids
Navigational aids in a PDF include links, bookmarks, headings, table of contents, and preset tab order for form fields.
Navigational aids assist users in understanding the document without reading completely through it. Bookmarks are
especially useful and can be created from document headings.
Document language
Specifying the document language in a PDF enables some screen readers to switch to the appropriate language.
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