A PDF stores a page; an e-reader has a small screen and a reader who has already chosen their type size. This converts the one into the other, so the text reflows instead of being shrunk to fit.
Result
sections
Sections found
You can, and that is why the problem is familiar: a PDF has a fixed page width and fixed type size, so on a six-inch screen the whole page is shrunk to a postcard and you pan around it. EPUB stores the text rather than the page, so the reader lays it out at the size you chose. No amount of zooming fixes a fixed layout.
Yes. Amazon stopped accepting MOBI for Send to Kindle in 2022 and takes EPUB directly now, so EPUB is the current format for both Kindle and Kobo — Kobo has always read it natively. There is nothing further to convert after this.
Because it is a scan: a picture of text rather than text. There is nothing to reflow, and no converter can recover characters that were never in the file — reading letters out of an image needs OCR, which this tool does not do. The tool says so and names the pages rather than handing you a book of empty chapters.
They are inferred, not read, because a PDF never records that something is a chapter. Top-level headings become chapters, and a heading with nothing above it is ignored — otherwise a running header at the top of every page would produce a table of contents with one entry per page. Check the sections listed before you download; that is why they are shown.
No. The text extraction, the structure inference and the packaging all happen in this tab. The documents people most often want on an e-reader are their own — reports, papers, manuscripts — which is exactly the material worth not uploading to a converter.