How to Read an EPUB File on Any Device

EPUB is a common ebook format designed to adapt text to different screen sizes. Unlike a fixed-page document, its lines usually reflow when you change the font size or rotate your screen. To read one, you need the EPUB file and an app or program that supports it. The steps vary slightly by device, but the basic process is to open or import the file and then use the reader’s controls.

What You’ll Need

An EPUB file: Save it on your device or in a cloud folder you can access. EPUB files commonly end in .epub. Make sure the file comes from a source you trust.
A compatible reader: Use an ebook app on a phone or tablet, an ebook program on a computer, or a dedicated ebook reader that supports EPUB. Built-in support varies by device and software.
Optional internet access: You may need a connection to get an app, download the book, or sign in to the store that supplied it. Once the book is downloaded, many readers work offline.

Step-by-Step

Find the EPUB file. Check the Downloads folder, your email attachment area, or the cloud storage location where you saved it. Confirm the filename ends in .epub. If you received a link rather than an attachment, download the file from the source’s official page or app.
Choose a reader for your device. On a phone or tablet, look for an ebook reader that explicitly supports EPUB in the device’s app store. On a computer, use a trusted desktop reading program or a compatible web-based service. On a dedicated ebook reader, check its manual or support page: some models open EPUB files directly, while others require transfer through the manufacturer’s app or library software. App features and menu names can differ by version.
Install or open the reader. If you already have a suitable app, open it. Otherwise, install one from the official app store or software provider, then launch it. Avoid installing unknown programs or opening unexpected attachments; an ebook should not require you to disable security protections.
Open or import the file. The simplest method is often to tap or double-click the EPUB file and choose the reader when prompted. If that does not work, open the reader and look for an option such as Open file, Import, or Add book; the exact wording and path may differ by version. Browse to the file and select it. Some readers automatically add imported books to a library.
Wait for the book to load. The app may take a moment to build a table of contents or prepare the cover and text. If prompted to sign in, check whether the book requires an account or belongs to a particular store. A regular, unprotected EPUB often opens without a store login, but access rules depend on the book’s source.
Start reading and navigate. Tap or click the book in the library. Swipe, tap the screen edge, press an arrow key, or use the reader’s page controls to move through it. Open the table of contents to jump to a chapter. Use search if the reader offers it and you need to find a word or passage.
Adjust the display. Open the reading settings to change font size, typeface, spacing, margins, brightness, or background color where available. You can usually rotate a phone or tablet to change the layout. EPUB text reflows, so a larger font may create more screen turns without removing the book’s content.
Save your place and continue later. Most readers remember the last page automatically; bookmarks and notes may also be available. If you use more than one device, check whether the app syncs reading progress and whether you are signed in to the same account. Do not assume notes or progress transfer between unrelated apps.

Common Mistakes

Trying to open the file in an unsuitable app: A photo viewer or basic document editor may not understand EPUB. Choose a reader that lists EPUB support.
Renaming a different file to .epub: Changing the filename extension does not convert a PDF, web page, or other document into an EPUB. Use the original format or a legitimate conversion tool if you have permission to convert it.
Assuming every ebook is unrestricted: Some books have digital rights management (DRM), which can limit which apps or devices can open them. Use the retailer’s approved app or instructions rather than trying to bypass those restrictions.
Opening a suspicious download: EPUB is a book format, but files from unknown sources can still be unsafe or mislabeled. Avoid unexpected downloads and do not install extra software just because a file asks you to.
Expecting identical page numbers everywhere: Reflowable text changes layout with screen size and font settings. Page locations can differ between devices, so use chapter headings, bookmarks, or search when a page reference does not match.

Tips

Keep a backup copy of books you are allowed to download, especially before moving or deleting files. Check the source’s terms for any restrictions.
If an EPUB arrives as a ZIP archive, check the source’s instructions before extracting it. A standard EPUB is packaged like an archive internally, but you normally open the .epub file directly in a reading app.
Use the contents list to move between chapters, and add bookmarks to return to important sections. These tools are often easier than trying to remember a page number.
For comfortable reading, test a few font sizes and backgrounds. A setting that works in daylight may be less comfortable in a dim room, and display options vary by app.
When transferring a book to an e-reader, follow the device maker’s supported method. A USB cable, library program, or account-based delivery may be needed, depending on the model and the book’s DRM.

Troubleshooting

The file will not open: Confirm it is fully downloaded and ends in .epub, then try the reader’s import option. If the file is incomplete or damaged, download it again from the original source.
Your device says the format is unsupported: Install a reader that supports EPUB or use the book provider’s approved app. For a dedicated e-reader, check its support instructions before transferring the file.
The book opens but asks for authorization: The title may have DRM or require an account. Sign in to the store or service that supplied it and follow its official instructions. Contact the seller or library if access still fails.
The text looks strange or is missing: Close and reopen the book, update the reader through its official source, and try a different supported app. If only one book has the problem, its file may be faulty; ask the source for a replacement.
The file opens in the wrong app: Use the device’s share or “open with” option to select your reader. Menu names and default-app controls differ by operating system and version.

Frequently Asked Questions

Can I read an EPUB without an internet connection?

Usually, yes, once the file is downloaded and available in your reader. A store account or DRM authorization may still be required for some books.

Can I read an EPUB in a web browser?

Some browsers or online services can display EPUBs, but built-in support is not universal. A dedicated reading app is often more reliable, particularly for bookmarks and offline reading.

Can I read an EPUB on a Kindle?

Support depends on the Kindle model and the delivery method. Check the device maker’s current instructions; a store-approved send-to-device service may accept EPUB and handle conversion, while direct file support can vary.

Is EPUB the same as PDF?

No. EPUB text generally reflows to fit the screen, while a PDF usually preserves fixed page layouts. A PDF may be preferable when exact page design matters; EPUB often makes adjustable text easier to read on small screens.

Why does my EPUB have different page numbers on another device?

Font size, screen dimensions, and reading-app layout change how much text fits on each screen. Use chapter headings, a bookmark, or search to find the same passage across devices.

Further reading: International Digital Publishing Forum. Details can change, so check the official page for anything that matters to you. Spotted a mistake? Tell us. How we write an answer.