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Glossary

What is a tagged PDF?

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A tagged PDF contains a structure tree that marks headings, paragraphs, lists, tables and the reading order, on top of the drawn text. Tags are what screen readers use, and PDF/UA requires them.

Why it matters when you convert a PDF to EPUB

When tags are present and correct, they tell a converter the structure directly. Many PDFs have no tags, or tags generated badly, so a converter cannot rely on them and has to infer paragraphs, headings and reading order from the positions and sizes of the text.

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FAQ

What is a tagged PDF?

A tagged PDF contains a structure tree that marks headings, paragraphs, lists, tables and the reading order, on top of the drawn text. Tags are what screen readers use, and PDF/UA requires them.