What is a running header?
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A running header (or footer) is text repeated at the top or bottom of every page of a printed document, such as the book or chapter title and the page number. It is page furniture, not part of the text.
Why it matters when you convert a PDF to EPUB
In a PDF, running headers are ordinary text, so a naive converter pastes "Chapter 3 · 47" into the middle of sentences every page. EPUBLab compares pages to detect text that repeats at the same place and removes it, page numbers included.
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