EPUB conversion is about taking an ebook apart so you can use the pieces. A .epub file is really a packaged bundle of web pages: the tool unpacks it in the browser, reads the book title, author and spine order out of the OPF manifest, and parses every chapter into structured blocks — headings, paragraphs, images. The chapter list sits on the left and a preview of the selected chapter on the right (cut off after 4,000 characters), and then the whole book is exported: TXT for a reader or a read-aloud app, Markdown that keeps the heading hierarchy, or a PDF with the illustrations in place, reflowed to A4 with optional page numbers.

It handles .epub only, and only without DRM — an encrypted ebook bought from a store will not open.

1. 01Upload the .epubthe progress bar shows “parsing chapters”; when it finishes you get the chapter count plus the title, author and total word count.
2. 02Browse the chaptersclick any entry on the left and the right pane shows a plain-text preview of that chapter. A chapter title is taken from the first heading element in the chapter, and where there is none it reads “Chapter n”.
3. 03Set the PDF options (optional)“PDF body font size” from 9 to 16 pt (11 by default) and a “show page numbers in the PDF” switch; TXT and Markdown are unaffected.
4. 04Export“Convert to PDF” (progress runs “preparing image assets” → “laying out pages”), “Download TXT” or “Download Markdown”, producing <original-name>.pdf, <original-name>.txt and <original-name>.md.

Input

.epub only (EPUB 2 or 3); .mobi and .azw3 are not supported, and a DRM-protected ebook reports a parse failure.

Chapter parsing

files are processed in spine order, so anything not listed in the spine does not appear; images embedded inside an SVG cover are ignored; at most 150 images per book, and illustrations beyond that leave their position empty.

TXT and Markdown

TXT drops all formatting and lays tables out in tab-separated columns; Markdown keeps headings, bold and italic, lists, quotes and tables, and writes every image as a *[image]* placeholder.

PDF

reflowed to A4 with 18 mm margins and 1.55 line spacing, using a system Chinese font, and every page is a bitmap (the text cannot be selected); the original book CSS, fonts, footnote links and table-of-contents bookmarks are not kept.

What it does not do

it does not create or edit .epub files, does not convert to .mobi or .azw3 and does not remove DRM; if you only want the plain text laid out as a fresh PDF, export TXT first and give that to “Text to PDF” with your own font size and line spacing.

The EPUB is unpacked, parsed and converted in the browser, and the book content is never uploaded to any server; the data leaves memory when the page is closed.