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BookFoundry
Any document or book. 18 languages, read native.

AI Book Translation: Translate a Document or Book

Upload a document or book as EPUB, PDF, DOCX, or Markdown, or pick one you made with BookFoundry. We translate it into 18 languages, then a native-voice pass rewrites every chapter so it reads like a local author wrote it, not machine-translated. Your structure and formatting stay intact, and you export retail-ready DOCX, EPUB, and PDF in each language. Free to try, no credit card.

Translate your document or bookSee pricing
700+
books generated
600+
writers on the platform
18
book languages
DOCX · EPUB · PDF
KDP-ready exports

Live platform totals, verified

Why it works

18 languages and dialects

From Spanish and Arabic to Japanese, Polish, and Swedish. Pick the language and the regional dialect, and the whole book is translated, not just sampled.

A native-voice pass

We translate first, then rewrite in the target language so it reads like a local author wrote it. No calqued phrasing, no machine-translation tell.

Formatting stays intact

Chapters, headings, front matter, and structure carry over. Export retail-ready DOCX, EPUB, and PDF in every language you choose.

How it works

  1. 1

    Upload your document or book

    Bring in a document or book as EPUB, PDF, DOCX, or Markdown, paste text, or pick one you made with BookFoundry.

  2. 2

    Choose your languages

    Select one or more target languages and the dialect that fits your readers.

  3. 3

    Translate and export

    The engine translates, runs the native-voice pass, and gives you retail-ready files in each language.

Translate your document or book

Translation that pauses instead of failing

Translation runs on the server and survives a closed tab. If credits run out mid-book it pauses with every delivered chapter saved, and resumes later without re-charging a delivered chapter. Each chapter is translated and then rewritten in a second native-voice pass so it does not read like machine translation, and the result is a new first-class book you can edit, cover, export and narrate. One source book can be translated into multiple target languages across the 49 supported locales.

Why book translation is harder than document translation

Paste a page into any translator and you get a decent page. Do that four hundred times and you get a book that quietly falls apart. The protagonist is Elena in chapter two and Helena in chapter nineteen. A term of art you coined is rendered three different ways. The register drifts from formal to chatty because each request arrived with no memory of the last. Length is what breaks machine translation, not difficulty. BookFoundry handles a book as a book: before any chapter is translated it reads a sample of your source and builds a brief for that specific book and that specific target language, fixing how proper nouns, character names and recurring key terms will be rendered. Every chapter is then translated against that same brief. Consistency is the single largest quality lever at book length, and it is the one a page-at-a-time tool cannot pull.

Translated, then rewritten by a native voice

Translation happens in two passes, not one. The first carries the meaning across. The second rewrites the chapter in the target language so it reads as though it was written there: idiom instead of calque, natural sentence rhythm, the small choices a translator makes and a converter does not. The passes are separate on purpose, because they are different jobs and doing them in one step produces text that is accurate and lifeless. If one section reads stiff you can re-run only the voice pass on that chapter, without re-translating it, and you are billed for the voice pass alone rather than for the whole job again. If the source book was generated here, its own voice settings are read and carried into the translation rather than being invented from scratch.

Nothing is silently cut

This is the failure nobody warns you about. A translation model answers in one response with a hard output ceiling, so a long chapter sent whole comes back truncated, and the truncation is invisible: the text simply ends and reads as though the chapter was short. BookFoundry splits each chapter into pieces under a safe budget and translates them separately, then reassembles. The splitter walks every top-level block, not just paragraphs, so headings, blockquotes, lists and tables all survive instead of being dropped on the floor. A block too large to split, a wide table for instance, is passed through whole and flagged rather than cut. Your chapter structure, headings and front matter come out the other side intact.

What it costs, and what you can stop paying for

One credit per ten thousand words. Before you commit, a free estimate runs on the server and the exact cost appears on screen, so nothing is ever deducted before you have seen the number. That estimate is built by summing the same per-chapter charges the engine will actually make, which is why the preview is never lower than the final bill. A chapter is charged once on its own word count, so splitting it internally or retrying it never multiplies the price, and an empty chapter is skipped rather than billed. Editing a passage by hand in the side-by-side review saves without re-translating and without a new charge. Re-running just the native-voice pass is billed at eight tenths of the full rate, because that pass is the expensive half of the work rather than a formatting touch-up.

What to bring, and what this does not do

Start from a book already in your library, upload a file, or paste text. Uploads accept DOCX, EPUB, PDF, Markdown, HTML and plain text up to fifty megabytes. What this does not do is publish for you: no store account is connected here, so the translated files are yours to upload, and each market has its own listing to write. It is also not a certified or sworn translation, so it is not the tool for a legal document that needs a translator's attestation. And it will not tell you whether a market wants your book. It produces a finished, readable, correctly formatted book in another language, which is the part that used to cost more than most independent authors could justify.

Frequently asked questions

Yes. The engine translates the entire document or book, chapter by chapter, keeping your structure and formatting intact, not just a sample passage.
Native. After the translation, a native-voice pass rewrites the text in the target language so it reads like a local author wrote it, without the usual machine-translation tells.
18 languages, with 49 language-and-region variants: 12 Arabic (Modern Standard plus 11 regional), 8 Spanish, 5 English, 4 French and 3 German among them. Prose is written natively in the target language, not translated from English.
The same retail-ready formats as every BookFoundry book: DOCX, EPUB, and PDF, one set per language you translate into.
One credit per ten thousand words. A free estimate runs before you commit and the exact figure appears on screen, so nothing is charged before you have seen it. The estimate sums the same per-chapter charges the engine will make, so it is never lower than the final bill. A chapter is charged once on its own word count, so splitting it internally or retrying it never multiplies the price, and an empty chapter is skipped rather than billed.
A book already in your library, an uploaded file, or pasted text. Uploads accept DOCX, EPUB, PDF, Markdown, HTML and plain text up to fifty megabytes. One source book can be sent to several target languages, and each result is a full book in your library in its own right.
Yes. You can stop after the current chapter and come back later, and the chapters already delivered are not charged again when you resume. A run that is stopped only ever paid for the chapters it finished.
Every chapter opens in a side-by-side review where you can rewrite any passage by hand, and those edits save without re-translating and without a new charge. If a whole chapter reads stiff you can re-run just the native-voice pass on it, billed at eight tenths of the full rate rather than as a fresh translation.
Long-form consistencyHow BookFoundry Maintains Long-Form Story ConsistencyEvery reported contradiction quotes both passages verbatim and links to their chapters. A claim whose quote cannot be found word-for-word in your text is discarded rather than shown.

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Translate your document or book
18 languages DOCX + EPUB + PDF Free to start