PDFs make published work portable, but they are not all equally machine-readable. A publisher PDF may contain a clean text layer, while a scanned report may be only an image. Tables, columns, figures, footnotes, and hyphenation can also change the meaning of extracted text.
Extraction is a convenience, not verification
Searchable text can help locate a passage quickly, but important quotations should always be checked against the visible original. This is especially important for numerical results, table headings, negations, qualification language, and author names.
Keep source context attached
A sentence can look persuasive when separated from its methods, population, or limitation. When selecting evidence, keep enough surrounding material to understand what the authors actually examined. If a table or figure is central, read its note and related narrative rather than relying on a copied value.
Respect rights and confidentiality
Only upload material you have the right to use. Do not use PDF tools to bypass access restrictions, and do not place confidential reports, participant information, or unpublished manuscripts into a shared workspace without an appropriate agreement.
Try it in Byleron Research: Add PDFs to the library for contextual reading and discussion, then compare each key quotation with the original PDF before publication.