Translate a book with AI, save hundreds of hours
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EPUB, DOCX, IDML, PDF... (max. 70MB/book)
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This might take up to two minutes if a PDF is involved
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Ready-to-Review Book Translations in Minutes to Hours, Not Weeks
Benefit from a battle-tested AI pipeline as a book translator. We do way more than using a good prompt!
Original book
Quality translation with perfect layout
Collect
Custom instructions & style preferences.
Analyze
Builds a glossary and translation guide.
Translate
With intelligent context, using top AI models.
Self-Review
Fixes errors, inconsistencies, awkward phrasing.
Rebuild
Translated file with exact same layout.
Collect
Custom instructions & style preferences.
Analyze
Builds a glossary and translation guide.
Translate
With intelligent context, using the best AI models.
Self-Review
Fixes errors, inconsistencies, awkward phrasing.
Rebuild
Translated file with exact same layout.
... to translated with perfect layout!
Stop Sacrificing Quality For Speed In Your Book Translation
Our authors report 95% accuracy out of the box. For many, the translation is publish-ready with light proofreading.
Professional human translation can be great, but costs $5,000 to $17,000 and takes weeks. Copy-pasting into ChatGPT loses context between chapters, forgets character names and genders, and shifts tone mid-book.
Because our AI book translator can translate with awareness of your entire book, it knows the protagonist on page 300 is the same as the one on page 4. The AI pipeline self-evaluates for fluency and maintains consistent terminology, honorifics, and voice throughout.
Three quality tiers let you choose your depth:
- Standard — Quick prototyping, ready in minutes
- Pro — Enhanced consistency and fluency, still in minutes
- Author — Deep analysis with translation guide, maximum quality
"I'm fluent in Spanish and it's remarkable how well the program translates, even metaphors."
Don't Waste Time on Layout. Your Book Will Look The Same, In Another Language.
Your book translation preserves font weight, images, footnotes, headings, layout... Even in complex files like InDesign IDML.
If you've spent hours on your original book's formatting, you probably don't want to redo it all after translation.
Our AI engine translates almost all file formats natively: we don't convert to plain text and back. The translation gets inserted directly into your original file and what you get back is your book, looking the same, in another language.
Supported formats with full layout preservation:
- EPUB, MOBI, AZW3... (ebooks)
- DOCX, DOC, ODT (Word documents)
- HTML, FDX, and more
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IDML (InDesign)IDML files don't reflow with text length. We'll insert translations exactly in place with everything preserved, saving a ton of manual work.
IDML files don't reflow with text length. We'll insert translations exactly in place with everything preserved, saving a ton of manual work.
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PDFText needs to be extracted and PDF layout will change. We use a state-of-the-art analyzer that handles complex, multi-column, or scanned PDFs.
Text needs to be extracted and PDF layout will change. We use a state-of-the-art analyzer that handles complex, multi-column, or scanned PDFs.
"The formatting is preserved perfectly. More reliable than other similar services I have been trying."
Control The Voice Of Your Book Translation
Let the AI pick good defaults, or shape the result with custom instructions, reference texts, and an automatic translation guide.
"You walk into the room" could be translated as "Tu entres dans la pièce" or "Vous faites votre entrée dans le salon." Formality, word choice, rhythm, all of those can give a very different feel to a book.
Let the AI make consistent decisions for you by itself or control the details - you decide!
You control the output:
- Custom instructions Tell the AI to use informal pronouns, adopt a specific tone, or translate key terms your way.
- Reference text Upload a passage of a text you already like to have the AI learn your preferred style from it.
- AI Translation guide In Author Mode, the AI builds an editable guide to keep terminology, names, and tone consistent across every chapter.
Use informal "tu" for dialogue.
Keep a victorian-era, steampunk tone.
Translate "The Guild" as "La Guilde".
| Term | Translation | Note |
|---|---|---|
| Elena Whitewood | Elena Whitewood | Keep original |
| The Guild | La Guilde | Custom instruction |
| Tone | Formal narration, informal dialogue | |
People ❤️ Our Book Translator
See what our thousands of users are saying about our service
"I had my book translated using Translate a Book with AI, and my Portuguese translator confirmed the translation was truly perfect! We only found a few minor spacing errors and one unfamiliar word in a title—nothing major at all. The quality exceeded my expectations."
"This service is absolutely awesome and run by an incredible team who are super helpful and kind. I used it to translate a book into Italian and it gave me a great first pass at the translation, which would have otherwise taken me weeks!"
"Your system has saved me a lot of painful hours haha. Thank you for your time."
"I love that the file keeps its formatting. The translation is 95% perfect. I will for sure try some more languages in the future."
"Many many thanks for your services. Your site is very useful."
"Amazing experience. Robin carefully worked with me to make sure I was satisfied with all the translations. The output was fantastic and I would recommend this to anyone in need of great service and great product."
"Replying just to tell you that I’ve had you translate three of my books and I’m pleased with the results. I’m fluent in Spanish and it’s remarkable how well the program translates, even metaphors."
"The formatting is preserved perfectly I believe. I am very satisfied with it. As long as nothing changes, I plan to continue using your service, as it has shown to be more reliable than other similar ones I have been trying so far."
"The translation into Portuguese [was] practically perfect."
"Absolutely incredible. No annoying subscription. Just the price for the books I want. Thank you."
Preview Your Book Translation First. Remove Any Risk.
Preview how the translation will be, on your actual document.
Every book is unique and we want you to be confident you'll like the result: upload your book and translate part of it for free (or for 5€ in Author Mode).
Not quite right? Add custom instructions and try again until it matches what you're looking for, or reach out at [email protected]. We'll be happy to help!
"El viejo farero observaba la tormenta acercarse, sus manos curtidas aferradas a la barandilla..."
Free in Standard & Pro modes, 5€ in Author mode
Book Translation Plans for Every Use Case
Personal, professional or publishing use? We've got you covered!
(previews available)
Standard Mode
Solid and fast result, ideal when perfect consistency doesn't matter too much.
Pro Mode
Balances speed with depth, for strong fluency and consistency. Best possible result in a dozen minutes.
Author Mode
Feels the most like a human translator. Does a deep analysis of the book before translating slowly, maximizing quality.
Standard Mode
Solid and fast result, ideal when perfect consistency doesn't matter too much.
Pro Mode
Balances speed with depth, for strong fluency and consistency. Best possible result in a dozen minutes.
Author Mode
Feels the most like a human translator. Does a deep analysis of the book before translating slowly, maximizing quality.
Your Manuscript's Translation Stays Yours
No AI training on your content. Automatic deletion. No attribution required.
We get it, a book manuscript is the result of hundreds to thousands of loving hours, and it's a very precious thing. Privacy and security matter!
Files are automatically deleted from our servers after 30 days. The AI providers we use do not train on your content. We don't require attribution, and we don't claim any rights to your work.
You own your translation completely.
Automatic Deletion
Files removed from our servers after 30 days
No AI Training
Your content is never used to train models
No Attribution
Publish freely, no credit to us required
20+ Formats, Dozens of Languages. Battery-Included Book Translator.
EPUB, DOCX, PDF, IDML, and many more. With the option to convert your translated file to other formats.
If your file is text based, we probably support it already (and if we don't, tell us)! We support dozens of formats natively, and you'll be able to convert your file to another format straight from the translation page.
We can even handle your scanned PDFs, as we support text extraction of complex layout through state-of-the-art OCR technology.
Frequently Asked Questions
First things first: AI models have become really good at handling text, so your translation should be really good too! Authors are reporting massive time savings using our service, with some publishing their translations almost immediately.
For publication, we still recommend doing a proofreading of the translation to ensure it's error-free and the AI didn't get confused anywhere. Depending on the degree of control you want over the output, this can go from a light spot-checking to a deeper style review.
Author mode will give you the best result in terms of fluency and consistency across the book. If you want maximum control over the style, you can add custom instructions and/or give a reference material to get inspiration from, and the AI will follow it.
Working with thousands of users, we've built a custom pipeline that will automatically split your book, translate and analyze it, do quality and fluency control, retry and reflect... All of this to get you the best possible result. We don't just send your text to ChatGPT with a cute prompt!
To power this system, we currently use a blend of Google Gemini Pro 2.5, OpenAI GPT-5, and DeepSeek V3. These are some of the current very best AIs in the world, each with their particular flavor and style.
We're also always evaluating new models to find the best matches for your language pair and book style - it's a fast moving landscape, and we're passionate about this topic!
Unless your file is a PDF, the answer is a simple yes!
You'll get a translated file in the same format as the one you uploaded, and unless specified otherwise all formatting will be preserved. This includes images, tables, links and other typographic elements, as well as the full layout.
PDFs need to have their text extracted, so the final layout will change. We use a state-of-the-art advanced PDF analyzer that is at the top of current benchmarks, so we can still handle complex files while preserving semantic information.
If for some other reason your file format is complex and the layout will change, we will always warn you beforehand. Otherwise you'll get a beautiful book in the language of your choice in just a few minutes.
The quick answer: upload your book to get an exact quote!
The price depends on the length of your book, the file format, the language and the structure of your file. You should upload your book to get a quote (uploaded files are automatically deleted within 24 hours if you don't purchase a translation).
To give you a general ballpark however, Author Mode often costs from 50€ to 300€, Pro Mode from 15€ to 50€, and Standard Mode from 5€ to 20€.
Since our AI takes uses resources to produce your translation, we can't guarantee refunds for reasons other than technical difficulties (we do guarantee you'll have a working translated file, of course). We recommend doing a free preview if you're unsure about the result.
If there's an issue with your file or if for some reason you`re not satisfied with your translation feel free to reach out and we'll see if we can improve things together - we do want you to be happy with your result.
We are always adding more supported formats. EPUB and ebooks work especially well, as well as DOCX, HTML, IDML or TXT. PDF files are notoriously difficult to handle: we recommend translating the original file that was used to create the PDF instead if you can, otherwise we do have a great PDF analyzer and we provide ample previews to help you get a sense of what the result will look like.
The full list of currently supported formats is: AZW3, DOC, DOCX, EPUB, FB2, FDX, HTM, HTML, HTMLZ, IDML, MOBI, ODT, PAGES, PDF, PPT, PPTX, PRC, RTF, TXT
We're regularly improving this tool - if you need a specific file extension supported, let us know!
Because PDFs are a rigid format, we need to extract the text from your file, translate it, and then rebuild it. This process changes the layout: instead of replacing the text like in other formats, we have to build the file from scratch again. We have two analyzers - use the default one if the file is extremely simple (just the main text on full page, no footnotes or table or multiple columns), otherwise the advanced analyzer will give better results.
If you have access to it, we recommend using the file that was used to create the PDF instead - like a .docx or .idml file. This will preserve the layout much better. Do not try to convert your PDF file to another format though, we did a lot of research on what works best using our own PDF analyzer gives the best results (regular converters can turn PDFs into DOCXs that look good at first sight but are a complete mess internally, and are really hard to translate correctly).
We also support PDF made of scanned images: we use state-of-the-art OCR technology (following the latest benchmarks recommendations) to detect the text structure and extract the content from the images. It can handle tables and complex layout or preserve illustrations, though this will never be as good as using a native format.
We support InDesign .idml files perfectly, with the layout preserved. If your picture is a scanned PDF we can extract the text to translate it - the layout will change and the text won't be replaced in place (if there is a drawing with labels for example, either the system will consider it an illustration and include it as a picture or the text will be extracted and replace the image, but not both).
If there's an image format you'd like to use that we don't already support just reach out to let us know - we'll see if we can add it!
Your data is only used to provide you with this service or reach out to you regarding your translation.
Your email is only used to send you your translation or ask for feedback.
If you upload a file without ordering a translation, it will be deleted automatically from our server after 24h. All other uploaded files and translations are automatically deleted after a month (previews, after a week). You can ask for them to be deleted at any moment before.
We keep the metadata (like file name, topic, size...) for longer, to help us understand how the service is used over time. You can ask for deletion of this at any time if you'd like.
To run our chosen AI models we route parts of your file to providers that run the actual model for us; we only use providers that do not log the content of what's shared with them and do not train any AI model with it.
You can check the privacy policy for the full detail on all of this.
With our tool you can upload a book in any format and translate it with a cutting-edge AI that understands nuance and preserves formatting, giving you a beautiful and professional-looking result in a just few minutes.
We're proud to use an advanced AI model that supports dozens of languages and allows us to get a fluent result. You can tweak how we use the AI by switching translation modes. The system can handle files large and small, and most common file formats are supported (DOCX, EPUB, PDF, MOBI, AZW3, HTML, TXT...)
It doesn't require creating an account: the app is very simple to use and notifies you when it's done. Just upload a file and click translate!
