DualBook 8 languages

Free online tool — no sign-up

Translate an English book into German

Upload an English EPUB and get the first fifteen pages back in German. German will not let a sentence be translated left to right — the verb that decides what the sentence means often lands at the very end.

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

In a German subordinate clause the verb moves to the final position. That sounds like a grammar footnote and is in fact the central problem: you cannot start writing the German until you know where the English sentence is going, which is exactly what word-by-word machine translation does not do. Whole clauses have to be re-planned rather than converted.

On top of that sits the Sie/du decision. English "you" says nothing about the relationship; German commits to one in every sentence of dialogue, and getting it wrong does not read as a small error — it reads as a different social world.

Both are why the model reads the whole book first. It writes a guide — names, recurring terms, tone, and who addresses whom how — and every page is translated against that, so the address form and the vocabulary hold from chapter one to the end of the sample.

How it works

  1. Choose your English 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

    Names, terms and the Sie/du map are settled once, from the complete text rather than from a sample of it.

  3. The first 15 pages come back in German

    About 4,500 words, translated as whole sentences rather than as a stream of clauses.

  4. Download, or read it here

    A complete EPUB. Umlauts and ß pass through as ordinary text and render everywhere.

What this free tool does not do

Fifteen pages, not the book. About 4,500 words, counted in words rather than chapters.

German runs longer than English — often 15% or more in characters — so the translated sample fills more screen than the English did.

Compound nouns can be very long. The output uses normal German compounding rather than inventing hyphens, and the styling lets those words wrap rather than pushing the page sideways on a phone.

The text is sent to a server and discarded when the job finishes.

Questions

How is Sie vs du decided?

From the relationships mapped across the whole book, and then held for the whole sample. This is the clearest single reason the model reads the entire text first: a paragraph in isolation tells you nothing about how close two people are, so a per-paragraph translator re-guesses and the characters' relationships flicker.

Do long compound nouns break the layout?

No. Compounds are written the German way, and the translation paragraphs carry styling that lets an over-long word wrap instead of forcing the page to scroll sideways — which is the failure you see in most naive bilingual files on a phone.

Are umlauts and ß handled?

Yes, as ordinary Unicode text. No transliteration to ae/oe/ue/ss, which would be wrong in a book, and no font substitution — the file keeps its own stylesheet.

How much is free?

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

Translate the whole book

The app runs the same engine across the entire book and can show the German next to the English, with your position synced between devices.

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