Is it legal to translate a book? It depends on two things: who owns the copyright, and what you do with the translation. A translation is legally a derivative work, and under the copyright rules that most countries share (via the Berne Convention), the exclusive right to produce one belongs to the copyright holder. So translating your own book is always fine; translating someone else's book to sell or publish is not, without permission. The full picture, scenario by scenario, is below.
This article is general information, not legal advice. Copyright law differs by country, and edge cases deserve a lawyer.
The core rule in plain language
When you translate a book, you create a new work that is legally derived from the original. The right to create derivative works — translations, adaptations, film versions — belongs to the copyright owner, almost everywhere in the world. This is why translation rights are something publishers sell: a Spanish publisher licensing "Spanish-language translation rights" from an English-language house is buying exactly this right.
What that means in practice:
- The original text is protected for decades after the author's death (the term varies by country, commonly life + 70 years).
- A translation needs the holder's permission whenever it leaves your private sphere — published, sold, distributed, or used commercially.
- A new translation has its own copyright — so even a public-domain work's existing translation may still be protected. Translate from the original, not from someone else's translation.
Scenario by scenario
You wrote the book
Fully legal. You own the rights; translating your own work (or having a tool do it) is your call. This is the common case for indie authors preparing their own books for new markets.
You want to read someone else's book in your language
Translating a book purely for personal reading occupies a gray zone that varies by jurisdiction. Private-use exceptions exist in many countries, but they differ in scope, and a full translation goes beyond what some of them cover. Practically speaking, the risk of translating for your own reading is very different from distributing the result — but "very low risk" and "definitely allowed" are not the same sentence. If the book matters commercially to its author, the clean path is buying an existing translation or waiting for one.
You want to sell or publish your translation
This is the case where the answer is unambiguous: you need permission. Publishing or selling a translation of a copyrighted book without the rights holder's consent is infringement, regardless of how much you changed the text. Approach the author or the publisher's rights/permissions department; translation rights are typically granted by language and territory, sometimes with an advance and royalty structure. Start early — rights conversations take months, not days.
You received documentation and need it translated for work
Internal business use of materials you lawfully possess (a supplier's manual, a partner's report) is a different and generally lower-risk situation, but the contract governing those materials may still restrict translation or reuse. When in doubt, check the agreement or ask the document's owner.
How to get permission to translate a book
- Identify the rights holder — usually the original publisher, sometimes the author or their estate.
- Contact their rights or permissions department with: the book, your target language, the territories, the intended format, and your timeline.
- Expect a licensing offer (flat fee, royalty split, or advance against royalties). Sign before you translate a word for publication.
For public-domain works — classics whose copyright has expired — no permission is needed; verify the term has actually lapsed in the relevant jurisdiction, and translate from the original text rather than a still-copyrighted translation.
Where a translation tool fits in
A tool like GoodTrans processes whatever you upload, so the responsibility for having the right to translate the content sits with you — that is true of every translation tool and service. What the tool changes is the cost and speed of producing the translation itself: whole-book processing, terminology control, and review files are described in our guide to how to translate a book, and you can check the cost of a specific file with an estimate on the translate page before committing to anything.
The short version
- Your own book: translate freely.
- Someone else's book, for yourself: generally low-risk, jurisdiction-dependent, do not distribute.
- Someone else's book, to sell or publish: get written permission first, always.
- Public domain: translate away — but from the original, not a protected translation.
And when a project does have the rights sorted, an estimate-first workflow keeps the translation side predictable: see current packages on the pricing page.
