---
title: "Translate EPUB files"
description: "Translate EPUB books up to 25 MB and get a valid EPUB back. Chapters, contents page, title and description are translated while cover, fonts and styles stay as they were."
canonical: "https://ai-glot.com/docs/formats/epub"
updated: "2026-10-12"
---

# Translate EPUB files

EPUB books (`.epub`) are accepted up to **25 MB**. AI Glot reads each chapter, the contents page and the book's title and description, translates them, and repackages the book the way e-readers expect, with its language label updated. You get a standard EPUB back.

> **Tip: Try it free**
>
> Drop a book of up to 2 MB on the free [EPUB translator](https://ai-glot.com/file-formats/epub-translation) to try it with no account, five files a day. The app, the API and the CLI take EPUB files up to 25 MB.

## What is translated, and what is left alone

| Translated                                      | Left as it was                      |
| ----------------------------------------------- | ----------------------------------- |
| Chapter text, headings, lists and footnote text | Cover, images and fonts             |
| The table of contents                           | Stylesheets and layout              |
| The book's title and description                | Text inside images                  |
| Bold, italics and links inside a sentence       | Anything protected by DRM (refused) |

## What you can ask

**Keep the literary tone**

For a novel: sets the voice and protects names.

Translate the book into French. Keep a literary tone and leave character names and place names as they are.

**Non-fiction with terms**

For a guide or textbook: keeps technical vocabulary steady.

Translate into German. Keep a clear, neutral tone and translate technical terms consistently from chapter to chapter.

**Chapters only**

Leaves the title page and contents page in the source language.

Translate the chapters into Spanish. Leave the title page and the table of contents as they are.

**Spelling variant**

Chooses the regional variant of the target language.

Translate into Brazilian Portuguese, using informal address.

**Keep quotes in the source language**

Protects text that should stay as written.

Translate into Italian. Leave the poems and the quoted passages in English.

## Good to know

- **One target language per upload.** A book holds one language. If you ask for two, the plan translates one and says so. Run the file once per language: your [glossary](/docs/platform/glossaries) carries over, so names stay identical across editions.
- **Ceiling.** 25 MB. Output filter: not available, the whole book comes back.
- **Images.** Only text the book stores as text is read. There is no image recognition, so lettering inside a picture stays as it is.
- **DRM.** A protected book is encrypted and cannot be read. Use a copy you are free to convert.
- **Rights.** A translation is a derivative work. Use your own manuscript or a book you are licensed to translate.
- **Other ebook formats.** `.mobi`, `.azw` and `.azw3` are refused with a message asking you to convert the book to EPUB first.

## Related

- [HTML](/docs/formats/html) and [Markdown](/docs/formats/markdown) for web and docs content.
- [Word](/docs/formats/word) for the manuscript.
- [All file formats](/docs/formats)