Text layer
A visible page can contain text objects, image pixels, or both
If you can select words in a viewer, the PDF probably has extractable text. A scan can look perfectly readable while containing only an image. In that case this tool may return little or nothing because optical character recognition is a separate process. Run OCR with the correct language and review its output before relying on names, numbers, or legal wording.
Reading order
PDF coordinates do not always describe paragraphs the way a reader sees them
Two-column pages, tables, sidebars, footnotes, headers, and individually positioned letters can extract in surprising order. Cleanup can normalize spacing or line breaks, but it cannot infer every document structure. Compare headings and transitions with the source, search for known phrases, and extract smaller page groups when the layout is difficult.
Export
Choose TXT or another supported output for the next workflow, not for visual fidelity
Plain text is useful for notes, search, analysis, and accessibility workflows, but it does not preserve page design, images, fonts, tables, or links. Page separators can retain source boundaries, while joining lines may help prose and damage poetry, code, addresses, or tabular content. Keep the PDF beside the result for verification and citation.