DualBook 8 languages

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Translate a French book into English

Upload a French EPUB and get the first fifteen pages back in English. The difficulty here is not the words — French and English share tens of thousands of them — it is the sentences those words are arranged into.

The first 15 pages of text are sent to our server to be translated. The file itself stays on your device.

Literary French builds long sentences with clauses nested inside clauses, held together by a grammar that keeps track of them. English does not tolerate that structure for as long. A faithful translation has to decide, again and again, whether to preserve a sentence or break it — and a translator working paragraph by paragraph makes that call inconsistently, so the voice lurches between ornate and clipped.

Then there is on: the pronoun that means one, we, they, people, or somebody, depending entirely on context. English has no single equivalent, and choosing wrong quietly changes who did what.

Reading the complete book first is what makes the voice hold. The model builds a guide covering names, recurring terms, tone and narrative register before it translates a word, and the sample is produced against that guide.

How it works

  1. Choose your French EPUB

    A DRM-free EPUB. The file stays on your device; only the text of the sample is sent.

  2. The model reads the whole book

    It builds a guide first — names, terms, tone, narrative voice — so sentence style is a decision rather than an accident.

  3. The first 15 pages come back in English

    About 4,500 words as a complete EPUB you can download or read here. English typically runs shorter than the French it came from.

Honest limits

Formality is flattened. English has no vous. The distance a French narrator can create with a single pronoun has to be rebuilt in tone, and some of it does not survive.

Fifteen pages, not the book. About 4,500 words.

The text is sent to a server and discarded when the job finishes. The EPUB never leaves your device.

Questions

What happens to long French sentences?

They are kept where English can carry them and split where it cannot — but the important thing is that the decision is made once, as part of the register set from the whole book, rather than freshly in every paragraph. Consistency is what makes a translated voice believable.

Are accents and typography handled correctly?

Yes. Accented characters pass through as normal text, and French guillemets and dialogue dashes in the source are converted to English quotation marks rather than left in place, which is what an English reader expects.

Does it handle the passé simple?

Yes — it becomes the English simple past, which is the standard equivalence. What is lost is that the passé simple also signals "this is literature" to a French reader, and English has no tense that does that. Register has to carry it instead.

How much can I translate for free?

About 4,500 words, roughly fifteen pages, five books a day.

Read the whole book

The app translates the entire book and can show the English beside the French, so the original is there whenever the translation flattens something.

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