The Ultimate Guide to EPUB Files: Everything You Need to Know and How to Open Them

Key Takeaways

EPUB files are popular for storing eBooks and other content because they can display on screens as small as 3.5" and are supported by many eReaders.

To access an EPUB file, you can utilize Calibre or any other free desktop program. Alternatively, on your iPhone or Android device, you can make use of the pre-installed iBooks or Google Play apps.

For EPUB file conversions, Calibre remains a viable option. Additionally, there are several free online file conversion sites available including DocsPal, Convertio, ConvertFiles, and Zamzar.

A file with the .epub file extension is a widely utilized format for storing eBooks and other forms of content. EPUB, which stands for electronic publication, was designated as the official standard of the International Digital Publishing Forum (IDPF) in September 2007.

What Is an EPUB File?

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EPUB files can store a variety of elements such as words, images, stylesheets, fonts, metadata details, and tables of content. What sets EPUB files apart is their layout agnostic nature, which means that the formatting remains unaffected by the screen size they are viewed on. Whether displayed on a tiny 3.5" screen or a larger one, EPUB files can present content seamlessly. This, combined with the fact that EPUB is a freely available standard, is why a majority of eReaders support and embrace EPUB files.

How Do I Open an EPUB?

EPUB files are widely supported by hardware eReaders, making them the preferred eBook file format. Whether you have a Kobo, Barnes & Noble Nook, or are reading on your desktop using programs like Calibre or Stanza Desktop, opening an EPUB file is easy. The only exception is Kindle, as EPUB files cannot be read directly. However, there are methods to convert an EPUB file into a format that Kindle can use.

To open an EPUB file in Calibre, simply click the "Add Book" button and select the desired book. Once imported, double-click the file to access its contents.

To open eBooks on your iPhone or Android device, you can use the preloaded iBooks and Google Play applications. However, if you wish to open an eBook on your desktop, it is recommended to use a third-party application. FBReader is a widely used option among the many available.

How Do I Convert an EPUB?

To convert an EPUB file into another format, you must use dedicated software designed for this purpose. Changing the file extension directly may result in a corrupted and unusable file.

If you're not using Kindle, chances are your eReader already supports EPUB. Simply open the file on your eReader or smartphone. However, you can still use an EPUB file on Kindle, but you'll need to convert it beforehand. We recommend using Calibre, which not only allows you to open and view eBooks but also has a robust tool for converting your file into various formats, including MOBI, compatible with Kindle.

If you're not interested in downloading third-party software or if you only have a few books that need converting and don't want to go through the trouble, there are websites that can handle the conversion process for you.

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Some popular websites for free online file conversion are DocsPal, Convertio, ConvertFiles, and Zamzar. Among these, DocsPal is the easiest to use.

Simply visit any of these websites, upload your file(s), select the desired format for conversion, and let the website handle the rest! In some cases, you may need to provide a valid email address to receive the converted file via email.