PDF to EPUB Converter turns a PDF into a reflowable EPUB ebook that adapts to any screen, so the text no longer has to be zoomed and scrolled on a phone or e-reader. A PDF stores every line at a fixed spot on a fixed page and knows nothing about paragraphs or chapters, which is why most converters produce one paragraph per line, page numbers in the middle of sentences and a single endless chapter. This converter rebuilds the book from the page layout instead. It joins lines into real paragraphs using line spacing, indentation and line length, repairs words hyphenated at line ends, removes running headers, footers and page numbers that repeat across the pages, and reads two-column pages column by column. Chapters come from the PDF bookmarks when the file has them, otherwise from headings recognized by font size and weight. Images are placed where they appear in the text, while small decorations are skipped. Scanned PDFs without a text layer are read with built-in OCR in more than 30 languages, and password protected PDFs open once you enter the password. Before downloading you can rename or merge chapters and set the title, author, language and cover. Everything runs in your browser: the PDF is never uploaded and there is no daily limit or file size paywall. Tables and math formulas come through as plain text in reading order. To check the result use EPUB Reader, to change the details later use EPUB Metadata Editor, and for the opposite direction use EPUB to PDF Converter.
PDF and EPUB solve opposite problems. A PDF promises that a page looks the same everywhere, so it records the position of every word on a fixed page and nothing about what the words are: there is no notion of a paragraph, a heading or a chapter, only text drawn at coordinates. EPUB promises the opposite, text that reflows to any screen size and font size, and it needs exactly the structure a PDF leaves out. Converting therefore means reconstructing that structure from geometry. Words that share a baseline become a line; a gap wider than about one and a half letters splits a line into separate columns or cells. Lines become paragraphs when the spacing, indentation and line length say so, which is why a short last line ending with a period closes a paragraph while a full line continues it, even across a page break. Text that repeats in the top or bottom band of most pages is recognized as a running header or footer. Heading levels come from font sizes compared with the body text, and a level only counts as chapters if it actually divides the book instead of appearing once on the title page. Bookmarks, when present, are the most reliable map of all, so they take priority. Scanned PDFs add one more step: optical character recognition turns the page images into words with positions, and from there the same reconstruction applies.