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Translate an EPUB with a reading-first workflow built for desktop review and a result worth keeping as a book.

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

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The desktop app gives you a practical place to translate an EPUB, check the book on a larger screen, and keep the translated file locally when it is ready. That matters when the goal is to keep reading the book after translation.

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Translate an EPUB while keeping it comfortable to read

If you already have the EPUB, what matters most is a translated version that keeps the book shape intact instead of falling apart into raw text.

  1. Best for books that already exist as EPUB

    Useful when the book is already in EPUB format and the goal is to keep reading it in another language.

  2. The result should still feel like a readable book

    The point is not just translated text, but an EPUB you can still browse, keep, and come back to later.

  3. Desktop review helps before you keep the translated copy

    Many users still want to inspect the translated book in context before treating it as their reading version.

  4. Useful when you want the translated file to stay book-like

    The important outcome is a translated EPUB you can still browse by chapter, review on desktop, and keep for later reading.