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This is an automated structural check. Complex issues — reading order, table structure, image alt-text quality — still need human review.
Tagged structure
Whether the PDF has a tag tree (StructTreeRoot) so a screen reader knows the reading order.
Scanned / image-only
Whether there is a real text layer, or only page images with nothing for a screen reader to read.
Document language
Whether a default language is declared so text is pronounced correctly.
Document title
Whether a title is set and shown by the reader instead of the filename.
XFA forms
Whether the file is a dynamic XFA form, which assistive technology cannot use.
Encryption
Whether permission flags would block a screen reader from extracting the text.