Images are described

This check ensure that all images have an image description applied by means of alt tags, or have been marked as decorative (EPUB) / artifact (PDF).

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Adding alt tags to images in InDesign provides a text description of the image for users who are visually impaired and are using screen readers. This allows the reader to understand the content of the image and the context in which it is being used in the document.

Alternatively, marking an image as decorative will signal to a screen reader to skip over the image, and take it out of the reading flow.

InDesign’s Object Export Options dialog with Alt Text marked as 'Decorative'

To add an alt tag to an image…

  1. Select the image with InDesign's Selection Tool.
  2. Choose InDesign Object menu > Object Export Options.
  3. Select the Alt Text tab.
  4. Enter a description of the image in the Alt Text field.
  5. Click OK to save the alt tag.
InDesign’s Object Export Options dialog with Alt Text providing a text description of an image