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AI Book Translator

Use AI to translate book-length EPUB content with a workflow designed for long reading sessions, desktop review, and keeping the translated book for later.

Drop a PDF or EPUB here

Upload one document, then choose the result you want to create.

PDF or EPUB · one file at a time

Another language. Still your book.

From chapter headings to images, footnotes and text styles, the translation follows the structure and layout of the original. Read in a new language with a familiar reading experience.

Original · English

Calculus Made Easy

Chapter I

A little bit of. The sum of.

These dreadful symbols are:

(1) d which merely means “a little bit of.” Thus dx means a little bit of x; or du means a little bit of u. But you will find that these little bits (or elements) may be considered to be indefinitely small.

dx,du

(2) ∫ which is merely a long S, and may be called (if you like) “the sum of.” Thus ∫dx means the sum of all the little bits of x; or ∫dt means the sum of all the little bits of t.

∫dx,∫dt

The word “integral” simply means “the whole.” If you think of the duration of time for one hour, you may (if you like) think of it as cut up into 3600 little bits called seconds. The whole of the 3600 little bits added up together make one hour.

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Translation · European Spanish

El cálculo al alcance de todos

Capítulo I

Un poquito. La suma.

Estos temibles símbolos son:

(1) d, que solo significa «un poquito de». Así, dx es un poquito de x; du, un poquito de u. Pero verá que estos pequeños trozos (o elementos) pueden considerarse indefinidamente pequeños.

dx,du

(2) ∫, que no es más que una S alargada y puede llamarse, si lo desea, «la suma de». Así, ∫dx es la suma de todos los pequeños trozos de x; ∫dt, la de todos los de t.

∫dx,∫dt

La palabra «integral» significa simplemente «el todo». Puede imaginar una hora dividida en 3600 pequeños trozos llamados segundos. Todos esos 3600 trozos sumados forman una hora.

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  • Adjustable text
  • Fonts & styles

A new language, the same familiar book. Keep the chapters, images and original layout, and carry on reading in your favorite reader.

Desktop + iOS client

Download the desktop app to translate books with AI and review them properly

The desktop app gives you room to translate book-length content with AI, inspect the translated EPUB on a larger screen, and keep the file locally when it is ready. After review, you can continue reading later on iPhone or iPad.

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Use AI to turn a full book into something you can keep reading

If you want AI to help with a book-length translation, what matters most is not a quick sample but a readable book you can keep moving through chapter by chapter.

  1. Best for book-length translation tasks

    A good fit for novels, essays, and other longer EPUB books where the user wants AI assistance without giving up the practical shape of a readable book.

  2. The result should hold up over many chapters

    What matters most is a translated book that still makes sense to keep reading across chapters and sessions, not just a quick sample.

  3. AI output still benefits from review

    Desktop review remains important for book-length translations, especially when you want to judge consistency, readability, and whether the result is worth saving.

  4. Useful when you need AI help on a real book-length workflow

    The important part is ending up with a translated book you can review, keep, and continue reading instead of a pile of raw AI output.