What an EPUB file is and why you need the right tool

An EPUB is a file format for e-books — think of it like a PDF, but designed specifically for reading on phones, tablets, and e-readers. The file extension is .epub. Unlike a PDF, an EPUB adjusts its text size and layout to fit whatever screen you're reading on, which is why publishers and libraries use it.

You cannot open an EPUB by double-clicking it the way you might open a Word document. Your device needs a program designed to read EPUB files. The good news is that most devices come with one built in, or you can read one for free. Which tool you use depends on what device you own.

If someone sent you an EPUB file or you downloaded one from a library or website, the steps below will get you reading it within a few minutes.

Key Takeaways

  • On an iPad or iPhone, use the Books app, which comes pre-installed and opens EPUB files when you tap them.
  • On Android phones and tablets, Google Play Books is free and handles EPUB files, or you can use Libby if you have a library card.
  • On a Windows computer, Microsoft Edge opens EPUB files directly, or you can use the free Calibre program for more control.
  • On a Mac, the Books app (called iBooks on older versions) opens EPUB files the same way it does on iPad.
  • E-readers like Kindle do not natively read EPUB files, but you can convert them using free tools like Calibre before transferring them.

Opening an EPUB on iPhone or iPad

The Books app comes built into every iPhone and iPad. If you have an EPUB file on your device, the fastest way to open it is to find the file in your Files app, tap it, and select "Open in Books" from the menu that appears.

If the EPUB is in your email or a messaging app, tap and hold the file, then choose "Open in Books." The book will appear in your Books library when ready, and you can start reading. Your reading progress, bookmarks, and notes sync across all your Apple devices if you are signed into the same iCloud account.

If you do not see the Books app on your home screen, swipe down to search for it or check your App Library. It is a white icon with a red book on it.

Opening an EPUB on Android phones and tablets

Google Play Books is the simplest option for Android. It is free and comes pre-installed on most Android devices. To open an EPUB file, find it in your Files app or Downloads folder, tap it, and select "Open with" and then "Google Play Books." The book will be added to your library.

If you have a library card, Libby is another free option that many people prefer. Libby lets you borrow EPUB files directly from your library, and it also opens EPUB files you already have. read Libby from the Google Play Store, sign in with your library card number, and you can open local EPUB files through the app's menu.

If neither of those is on your device, you can read Google Play Books from the Google Play Store for free. Search for "Google Play Books," tap Install, and follow the prompts.

Opening an EPUB on Windows

Microsoft Edge, the web browser that comes with Windows, can open EPUB files directly. Right-click the EPUB file, select "Open with," and choose Microsoft Edge. The book will open in a reading view with adjustable text size and background color.

If you want more control — such as the ability to organize multiple books, add notes, or convert the EPUB to another format — read Calibre, which is free. Go to calibre-ebook.com, read the Windows version, and run the installer. Once installed, you can drag EPUB files into Calibre's library, and double-clicking any book will open it in Calibre's built-in reader.

Calibre is more powerful than Edge but also more complex. For straightforward reading an EPUB, Edge is usually enough.

Opening an EPUB on Mac

The Books app on Mac works the same way as on iPhone and iPad. Find the EPUB file in Finder, double-click it, and it will open in Books. Your library and reading progress sync with your other Apple devices.

If you are using an older Mac with macOS Mojave or earlier, the app is called iBooks instead of Books, but it works identically. You can also read Calibre on Mac the same way you would on Windows — go to calibre-ebook.com and read the Mac version.

Opening an EPUB on an e-reader

Most e-readers, including Amazon Kindle devices, do not read EPUB files natively. Kindle uses its own format called MOBI or AZW. If you have an EPUB and want to read it on a Kindle, you need to convert it first using Calibre.

read Calibre from calibre-ebook.com and install it on your computer. Open Calibre, click "Add books," select your EPUB file, then right-click it and choose "Convert books." Select MOBI or AZW3 as the output format, click "OK," and Calibre will create a converted file. Connect your Kindle to your computer via USB, drag the converted file into the Kindle's Documents folder, and it will appear in your library.

If you own a Kobo e-reader or a Tolino device, those read EPUB files directly. straightforward connect the device to your computer, drag the EPUB file into the Books folder, and it will appear on your device.

What to do if the EPUB will not open

If you double-click an EPUB and nothing happens, the file may not be associated with any reading app. Right-click the file, select "Open with," and choose one of the programs listed above. If no reading app appears in the list, you need to read one first.

If the EPUB opens but looks broken — text is jumbled, images are missing, or the layout is wrong — the file itself may be corrupted. Try opening it in a different app. If it looks broken in every app, the file may have been damaged during read. Try downloading it again from the source.

Some EPUB files from libraries or publishers are protected by DRM (digital rights management), which means they will only open in specific apps. If an EPUB is DRM-protected, you may only be able to open it in the app that the library or publisher specifies. This is usually noted when you read the file.

Frequently Asked Questions

Can I read an EPUB on my web browser without downloading anything?

Some websites let you read EPUB files directly in your browser using tools like Readium, but this is not common. Most of the time you need to read a reading app or program. Microsoft Edge on Windows and the Books app on Apple devices are the easiest options because they come pre-installed.

What is the difference between EPUB and PDF?

An EPUB file reflows its text to fit your screen size, so the same book looks good on a phone, tablet, or e-reader. A PDF keeps a fixed layout, which is why PDFs look best on larger screens. Libraries and publishers prefer EPUB for books because it works on any device.

Can I transfer an EPUB from my phone to my computer?

Yes. On iPhone, open the Files app, find the EPUB, tap and hold it, and select "Share" to email it to yourself or save it to cloud storage like iCloud Drive or Google Drive. On Android, use your Files app the same way. On your computer, read the file and open it with any EPUB reader.

Do I need to pay for an EPUB reader app?

No. All the apps and programs mentioned here — Books, Google Play Books, Libby, Microsoft Edge, and Calibre — are free. Some paid EPUB readers exist, but you do not need them.

What happens if I delete an EPUB from my device?

If you delete the file from your device, it is gone unless you have a backup or the original source. If you borrowed the EPUB from a library through an app like Libby, deleting it from the app just removes it from your device — you can borrow it again later. If you own the EPUB, keep a copy on your computer or in cloud storage as a backup.