Free EPUB Book Translator

How the EPUB translator works

An .epub is really a zip file: one XHTML document per chapter, plus a stylesheet, the cover, the fonts, and a manifest that says what order to read them in. Most "translate my book" workflows flatten all of that into a Word file or a PDF and hand you back something that is no longer an e-book. This tool translates the text inside the package and rebuilds the same zip, so what you download is still a book. Italics, links, and footnote markers are repositioned to fit the grammar of the target language instead of being pinned to the original word order.

What gets translated

• Every chapter: paragraphs, headings, lists, block quotes, and tables
• The book title and description your reader shows in its library
• Both tables of contents (the EPUB 3 nav page and the older NCX)
• Image alt text, so screen readers work in the new language too

What stays untouched

• Cover image, illustrations, fonts, and the stylesheet, byte for byte
• Reading order, chapter files, and internal links between chapters
• The author's name, URLs, email addresses, and code samples
• The language tag is updated to the target language, so your reader hyphenates and reads aloud correctly

Known limitations

• DRM-protected books cannot be translated by anyone. If the file came from Kindle or an Adobe .acsm link, its text is encrypted and no tool can read it.
• Text baked into a picture (a cover, a map, a scanned page) stays in the original language, because it is a picture. Our PDF translator can OCR scanned pages if that is what you have.
• Read-along audio narration (media overlays) keeps its original timing, so the narration will not match translated text.
• Kindle formats (.mobi, .azw) need converting to EPUB first, which Calibre does for free.

Tips for a book that reads well

• Use the glossary for character names, place names, and invented words. A novel is long enough that consistency matters more than any single sentence.
• Pick a specific target variant (Latin American vs European Spanish) for the right voice
• Leave source language on Auto-detect if you are not sure
• Skim a middle chapter after downloading, not just the first page