Style Studio is a typography workbench for EPUB files. Drop a book in (or arrive from any converter on this site via “Style it before downloading”) and set the typeface, text size, line spacing, margins, paragraph style and reading theme — with the actual book, live, as the preview. Nothing here is a mockup: the page you read while adjusting is your book, rendered in your browser.
When it reads the way you want, download. Your choices are written into the EPUB’s own stylesheet, so the file carries its typography to any reader app — Kindle (via Send-to-Kindle), Kobo, Apple Books, anything that opens an EPUB. The original file never leaves your device: the whole studio runs client-side, like every tool on this site.
Start from a converter → or open Style Studio with an EPUB you already have.