A complete guide to translating EPUB books online, including how to create bilingual readers with the original text as subtitles.
Reading in a foreign language is one of the most effective ways to build vocabulary and comprehension. But finding books translated into your target language can be difficult — especially for less common language pairs or niche titles.
Professional human translation of a full book costs hundreds or thousands of dollars and takes weeks. AI-powered translation lets you translate an entire book in minutes for a fraction of the cost.
Polytext translates EPUB books to 47 languages using Google's Gemini AI, preserving all formatting, images, and chapter structure.
You'll need your book in EPUB format. Most ebook stores sell EPUBs, and there are many free EPUB libraries online (Project Gutenberg, Standard Ebooks, Open Library). If you have a Kindle book, you can convert it to EPUB using Calibre.
Go to polytext.site and drag your EPUB file onto the upload area, or click to browse. The file will be uploaded and analyzed to give you a price estimate.
Before paying, you can preview the first 600 words of your book translated into your target language. This lets you check translation quality and make sure the output looks right.
Pick how you want your translated book: as a standard translation (just the translated text), as a bilingual reader (original text appears as subtitles under each paragraph), or both.
Pay via PayPal (starting at $0.99) and your translated book will be ready to download in EPUB, PDF, and TXT formats. You'll get an email with download links, and files are available for 5 days.
One of Polytext's most useful features for language learners is the bilingual reader. Instead of just translating the book, it places the original text as a subtitle under each translated paragraph.
Read in your target language and glance down at the original whenever you get stuck — no need to switch between two copies or look things up in a dictionary. It's like reading with training wheels you can ignore when you don't need them.
Spanish, French, German, Italian, Portuguese, Dutch, Russian, Chinese (Simplified), Chinese (Traditional), Japanese, Korean, Arabic, Hindi, Turkish, Polish, Vietnamese, Thai, Indonesian, Swedish, Danish, Norwegian, Finnish, Czech, Greek, Romanian, Hungarian, Ukrainian, Hebrew, Malay, Bengali, Tamil, Swahili, Persian, Catalan, Croatian, Serbian, Slovak, Slovenian, Lithuanian, Latvian, Estonian, Filipino, Urdu, Nepali, Sinhala, Burmese, and Khmer.
All formats included (EPUB, PDF, TXT). Every translation includes a free 600-word preview.
Upload an EPUB and preview 600 words translated free before paying.
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Everything you need to know about translating books online
You upload an EPUB file and receive the translated book in EPUB, PDF, and TXT formats. If you have a book in another format (like MOBI or AZW3), you can convert it to EPUB first using free tools like Calibre.
Most books are translated in 5-20 minutes depending on length. You'll receive an email when your translation is ready, so you don't need to wait on the page.
Polytext uses Google's Gemini AI, which produces natural, context-aware translations that read well as continuous prose. It's significantly better than older machine translation for books. Use the free 600-word preview to judge for yourself.
Bilingual reader mode puts the original text as a subtitle under each translated paragraph. This lets you read in your target language and reference the original whenever needed — ideal for language learners reading above their level.