Set the language for a block of text by selecting the text element or container element in the Content panel.(To display the Tags panel, choose View > Show/Hide > Navigation Panes > Tags.) Choose a language from the Language drop-down list. Then choose Properties from the Options menu. Expand the Tags root and select an element. Set the language for all text in a subtree of the tags tree.
(If the language doesn't appear in the drop-down list, you can enter the ISO 639 code for the language in the Language field.) This setting applies the primary language for the entire PDF.
This check determines whether the primary text language for the PDF is specified. Setting the document language in a PDF enables some screen readers to switch to the appropriate language. For more information, see Edit document structure with the Content and Tags panel. To display the Tags panel, choose View > Show/Hide > Navigation Panes > Tags.
To specify tags manually, do one of the following: Acrobat automatically adds tags to the PDF. To fix this item automatically, select Tagged PDF on the Accessibility Checker panel, and then choose Fix from the Options menu. If this rule check fails, the document isn't tagged to specify the correct reading order. Additional checks in the Preflight tool.Analyzing documents with the Preflight tool.Automating document analysis with droplets or preflight actions.
Correcting problem areas with the Preflight tool.Viewing preflight results, objects, and resources.
PDF/X-, PDF/A-, and PDF/E-compliant files.Playing video, audio, and multimedia formats in PDFs.Add audio, video, and interactive objects to PDFs.Edit document structure with the Content and Tags panels.Reading PDFs with reflow and accessibility features.Capture your signature on mobile and use it everywhere.Overview of security in Acrobat and PDFs.