How to Fix Reading Order and Tag Order in Accessible PDFs
Question details
The user needs to align or correct the reading order and tag order in complex accessible PDFs containing anchored tables, linked text frames, images, and EPS graphics.
- Product
- PDF Editors
- Device & OS
- not provided
- Scenario
- Remediating complex PDF documents exported from layout software to ensure they are fully accessible to screen readers.
- Observed behavior
- The visual reading order and logical tag order do not perfectly match, particularly around anchored objects, requiring manual structural corrections.
Ensure you have access to an advanced PDF editor with an accessibility Tags panel, or the original layout document if you plan to correct the structure before exporting.
Define Content Order Before Exporting
Use the Articles Panel in your layout software to set the intended reading sequence before generating the PDF, minimizing the need for manual remediation.
In complex documents created in layout applications like InDesign CC 2018 or newer, the Articles panel is the most effective tool to establish a correct tag structure. By defining the exact sequence of text frames, images, and tables, you can ensure the exported PDF closely mirrors the logical reading order.
Navigate to the 'Window' menu and select 'Articles' to open the panel.
Drag and drop text frames, anchored tables, and graphics into the Articles panel in the exact logical order they should be read by assistive technology.
When exporting the document to PDF, ensure the option 'Use for Reading Order in Tagged PDF' is checked to embed your custom sequence.
Manually Correct the Tag Sequence in the PDF
Use the Tags panel in your PDF editor to fix remaining mismatches when visual layout constraints prevent perfect alignment.
Edit and Optimize PDFs Easily with WPS Office
While advanced accessibility tagging is best handled in specialized prepress tools, WPS Office provides a comprehensive PDF editor for everyday text modifications, page management, and format conversions with complete ease.
- 1. Install WPS Office: Download and install the free WPS Office suite on your computer or mobile device.
- 2. Open the PDF: Launch WPS PDF and open your document to access the integrated editing tools.
- 3. Edit the Content: Navigate to the 'Edit' tab to modify text, adjust images, or reorganize pages as needed.
- 4. Save or Convert: Save your updated PDF directly, or use the 'Convert' tab to export the file to Word for easier structural editing.
Frequently Asked Questions
Why does the reading order differ from the tag order in complex PDFs?
Layout software often uses object order for visual presentation. This means anchored frames or floating graphics are treated as independent elements, which places them before or after the main text flow visually, causing an unavoidable mismatch with the logical tag order required by screen readers.
Is the tag order or the reading order more important for accessibility?
The tag order is the most critical for accessibility compliance. Assistive technologies, such as screen readers, rely entirely on the underlying tag tree to determine the logical sequence in which text and elements are announced to visually impaired users.
Do I always need to manually fix tags in accessible PDFs?
Yes, some manual remediation is almost always expected. Even with properly ordered elements in the source document, you should verify and adjust the final sequence using the Tags panel in your PDF editor to ensure full compliance.
