Prefer selectable text
A scanned image-only PDF is harder to search, copy, translate, and read with assistive technology. Use OCR when the document is meant to be searched or archived.
After OCR, search for a few words from the file to confirm the text layer is usable.
Use structure when possible
Headings, lists, table headers, and logical reading order make long documents easier to navigate.
For exported documents, prepare the source file with real headings and clear tables before converting to PDF.
Check visual clarity
Use enough contrast, avoid tiny text, and make sure rotated pages are corrected. Accessibility starts with basic readability.
For official accessibility requirements, use the standards and tools required by the organization receiving the file.