Add tags: A list offers Tag PDF and Retag Settings.

The Retag Settings dialog box offers the following:

• Tag PDF: see above.

• Tag annotations: Select to tag annotations for the PDF.

• Tag form fields only (accessible only when Tag annotations is selected): Use to include only form fields in the tag tree, but no annotations of any kind.

• Prefix and Postfix options for retagging.

Use the Options list to access more commands:

• New Tag: Creates a new tag at the current tag hierarchy position.

• Cut: Cuts the selected tag.

• Paste: Pastes the cut tag after the selected tag node.

• Paste Child: Pastes the cut tag under the selected tag.

• Delete Tag: Removes the selected tag.

• Remove Empty Tags: Removes empty tags from the selected branch.

• Find and mark Similar: Displays the Find Similar dialog box. Set the search threshold (Strict, Loose, or between), then click Find to perform the search for similar tags. Optionally, click Find settings to launch the Find Similar Attributes dialog box, where you may refine your search by specifying which font and text attributes to filter with. Select an attribute to use in the search or clear it to avoid.

• Change Tag to Artifact: Works on tags assigned to pictures. Turns the selected tag to an artifact, not to be processed by the text-to-speech engine. Provide Artifact Type and Attach to Side(s) in the Create Artifact dialog box, and then click OK to confirm the operation.

• Create tag from selection (only available after you have selected some PDF element with the Edit Object tool placed on the Edit > Modify ribbon. Inserts a new tag based on the selection.

• Find: Searches for all document elements such as Artifacts, Unmarked Comments, Unmarked Links, Unmarked Annotations, Unmarked Content that are not associated with any tag. You can search the current page or the entire document. Use it for manual tagging or verifying an existing tag structure by stepping through the located elements one by one.

• Highlight Content: Shows which file content is covered by the current tag.

• Properties: Displays the Object Properties dialog box. When you use it on a tag, it lets you edit the tag, attribute objects and classes. Using it on assigned content additionally lets you edit the container tag type and properties, or text attributes. It lets you view or change alternate texts or expansion texts for tagged objects. Alternate texts are used by screen readers to announce and describe graphic objects on the page.

Create tags root (only available for untagged PDFs): Creates the root object of the tag tree. This is the only menu item in the drop-down list under the Options menu (at the top of the Tags panel) for a non-tagged PDF. Alternatively, right-click No tags available and click this command. Use it to start building up a tag structure manually. Once the root is created, other commands become available in the drop-down menu.

Some PDF files may not have a tag structure. In such cases, the Tags panel shows an empty tree with the description No tags available. To create tags, you can either select to add them to your document manually or to use the built-in layout analyzer.

To run the layout analyzer, select Tag PDF from the panel toolbar.

When layout analysis is complete, located tags, with reference to their contents, are added to the tree. You can review and modify it, or add missed non-textual elements (the latter operation has to be done manually). Once the PDF is tagged, the tag menu is available.