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Drop in a Word file. Get back a valid EPUB and a paperback interior ready to upload to Amazon KDP, with the margins, the drop capitals and the line breaking that make a page look set rather than converted. It all happens in this browser.
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Why it reads as a book
Lines here are broken with the Knuth–Plass algorithm, the one TeX uses, over the whole paragraph at once rather than greedily, one line at a time, with hyphenation. That single difference is what removes the rivers of white space running down a justified page, and rivers are what make a self-published book recognisable from across a room before anyone has read a word of it.
The rest is the printer’s specification. 16 trim sizes, mirrored margins, and an inside margin derived from the final page count. Amazon widens that requirement in five bands, from 0.375″ upwards, because a thicker book opens less flat and swallows more of the gutter. The engine typesets the book, reads the real page count, and lays it out again.
None of it leaves your machine. An unpublished manuscript is the most private document most people own, and this site has no backend to send one to: turn off your network once the page has loaded and every feature still works.
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Contents
A .docx, a Markdown file or plain text. Chapters are found from your heading styles, your page breaks, or the lines that announce them, and the chapter list tells you which, so you can see whether to trust it.
Eight of them, each a complete set of typographic decisions rather than a colour scheme. Adjust the size, the leading and the trim, and watch the page count move.
A valid EPUB 3 with accessibility metadata, and a print PDF with embedded subset fonts. Both free, both unwatermarked, both generated on your machine.
None of these is visible on its own. Together they are the whole difference between a book and a converted document.
It takes about ten seconds to see what your book looks like set. Nothing is uploaded and nothing is asked of you.
Format a book