The 10 Best ePUB Converters

Convert ePUB files to common e-book formats with these tools

E-reader and books lying on a table

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When you’re ready to convert ePUB to Kindle or other e-book formats, find an e-book converter. Choose an e-book converter that works for you in this list of free ePUB converters.

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Manage an E-book Library with Calibre E-book Converter

A screenshot showing how to convert an e-book using Calibre
What We Like
  • Operates on Windows, macOS, and Linux

  • Converts files to AZW3, MOBI, PDF, and more

  • Free download and no ads

What We Don't Like
  • Somewhat complex for a new user

  • Help files are difficult to follow

  • Can’t open DRM-protected files

Calibre is an Open-source, free ePUB converter and e-book library management app that performs all your e-book converter needs. Calibre contains all the tools you need to download e-books to your device, read e-books, organize e-books into categories, and change the file format.

You’ll have many options when you convert e-book files from one format to another. A few ways you can customize the converted file include:

  • Edit the metadata
  • Change the text size and font
  • Create a table of contents
  • Replace text with regular expressions
  • Customize the output page size
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Convert Files Online or on Your Desktop with ePUBee ePUB Converter

A screenshot of the ePUBee ePUB Converter
What We Like
  • Desktop app is available for Windows

  • Can convert files in batches

  • Easy to use

What We Don't Like
  • Must remove DRM to convert files

  • Only converts files to EPUB, MOBI, PDF, and TXT formats

  • Cannot customize output

When you’re looking for a fast and easy way to convert your e-books into different formats, ePUBee gets the job done quickly. You won’t find any extras with ePUBee, only the ability to convert files.

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Convert E-book Formats with Convertio

A screenshot of the Convertio online e-book converter
What We Like
  • Chrome extension available

  • Can save files to Google Drive and Dropbox

  • Easy to use

What We Don't Like
  • 100 MB maximum file size

  • Cannot customize output files

  • Only converts files to EPUB, AZW3, and PDF formats

Sometimes e-book converters get hidden along with other types of file converters. Convertio is one of those web apps that converts thousands of file formats, e-book converters included.

Converting e-books with Convertio is easy. Just upload your file, choose an e-book format, and you’re done. 

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Convert E-books Online with Zamzar

A screenshot of the Zamzar online e-book converter
What We Like
  • Converts files to AZW, AZW3, EPUB, MOBI, and PDF

  • Simple to use

  • Uses HTTPS SSL 128-bit encryption to transfer files

What We Don't Like
  • Limited to 5 file conversions per day

  • Download files are saved for 24 hours

  • Uploaded files limited to 50MB per day

Another free and easy to use online ePUB converter is Zamzar. Zamzar converts thousand of file formats, not just ePUB files, however, the free Zamzar service provides basic e-book file conversions and doesn’t provide any options to customize the output file. After you’ve converted a file, be sure to download it within a day; after that, Zamzar deletes the file.

If you need any extra ePUB conversion services, such as larger file sizes and online storage, sign up for a subscription. Subscriptions start at $9 a month for a Basic plan.

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Convert E-books on Android with Ebook Converter

A screenshot of Ebook Converter for Android
What We Like
  • Converts EPUB to MOBI, PDF, and AZW3

  • Saves files to device

  • Easy to use

What We Don't Like
  • Must be online to convert files

  • Original file is deleted after the conversion

  • Converted files are deleted after an hour

File conversion apps aren’t just for Windows and not all of them are online. If you use an Android device, Ebook Converter is a basic conversion app that converts e-books into all the popular formats. The app also allows you to change the destination directory, select a cover, add an author name, and specify the book title.

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Get More Conversion Options with File Converter for Android

A screenshot of File Converter for Android
What We Like
  • Easy to share files with others

  • Converts files to EPUB, AZW3, MOBI, and PDF

  • Optimizes for different e-book readers

What We Don't Like
  • Must be online to convert files

  • Upload files limited to 100MB

  • Cannot convert password protected files

When you want a choice between converting ePUB files online or in an app, check out File Converter. With File Converter, you get an Android app and an online converter, both of which are easy to use and capable of converting most file types beyond just e-books.

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Create an ePUB E-book with Sigil Ebook

A screenshot of the WYSYWIG editing window in Sigil Ebook
What We Like
  • Runs on Windows, Mac OS, and Linux

  • WYSIWIG editor

  • Validates files for EPUB compliance

What We Don't Like
  • Only supports ePUB format

  • Not for beginners

  • User guide is complex

If you want to create your own e-book from start to finish, check out Sigil Ebook. Sigil Ebook is a complete, Open-source, e-book publishing platform, and is built for people familiar with desktop publishing and word processing apps. Sigil uses HTML format to create the book and files are saved in ePUB format.

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Convert E-books Online with EPUB Converter

A screenshot of the EPUB Converter online tool
What We Like
  • Converts most e-book formats

  • Automatically adjusts pages to fit e-readers

  • Can batch convert files

What We Don't Like
  • Cannot add metadata

  • Converters are on separate web pages

  • Format of PDF files is not always retained

Another online ePUB converter is EPUB Converter. EPUB Converter accepts most e-book formats and has different tools to convert to different e-book formats. EPUB Converter is easy to use; just select the converter you want to use and upload your file.

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Convert E-books with the To ePub Web App

A screenshot of the To ePub online e-book converter
What We Like
  • Batch conversions

  • Easy to use

  • Converts popular e-book formats

What We Don't Like
  • Can’t edit metadata

  • Converted files are held for an hour

Many of the online e-book converters are easy to use. Added to this user-friendly list of e-book converters is To ePub. To ePub works the same as most of the web apps; upload your e-book and To ePub does all the converting.

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Convert Every File Format with Online-Convert

A screenshot of the Online-Convert online e-book converter
What We Like
  • Can edit metadata

  • Has an Android app

  • Supports all e-book formats

What We Don't Like
  • Limited file size for uploads

  • Low conversion speed

  • Website is confusing to navigate

Many of the online e-book converters are extremely simple to use and don’t give you the option to edit the metadata. Online-Convert is different. It’s simple to use and has settings to change the metadata, set a font size, and add a border.