Software & Apps File Types 204 204 people found this article helpful What Is an EPUB File? EPUB is the most popular file format for digital books By Tim Fisher General Manager, VP, Lifewire.com Tim Fisher has 30+ years' professional technology support experience. He writes troubleshooting content and is the General Manager of Lifewire. our editorial process Facebook Twitter LinkedIn Tim Fisher Updated February 26, 2020 File Types Design Cryptocurrency MS Office Windows Linux Google Drive Apps File Types Backup & Utilities View More Tweet Share Email The EPUB file format (short for electronic publication) is an eBook format with the extension .epub. You can download EPUB files and read them on your smartphone, tablet, e-reader, or computer. This freely available eBook standard supports more hardware eBook readers than any other file format. EPUB 3.2 is the latest EPUB version. It supports the latest versions of HTML, CSS, and SVG, and has built-in support for embedded interactivity, audio, and video. If you're looking for free EPUB book downloads, know that there are lots of online resources where you can find free books, such as Open Library. How to Open an EPUB File EPUB files can be opened in most eBook readers, including the B&N Nook, Kobo eReader, and Apple's Books app. EPUB files have to be converted before they're usable on the Amazon Kindle. EPUB files can also be opened on a computer with several free programs, such as Calibre, Adobe Digital Editions, Apple Books, EPUB File Reader, Stanza Desktop, Okular, and Sumatra PDF. In addition to a few of the programs just mentioned, Mac users can read EPUB files with Kitabu. Plenty of iPhone and Android apps view EPUB files. There are also add-ons and extensions for Firefox and Chrome that let you read EPUB files in the browser just like other documents. EPUBReader for Firefox and Simple EPUB Reader for Chrome are just a couple examples. Google Play Books is another place you can open EPUB files by uploading the EPUB file to your Google account and viewing it through the web client. Since EPUB files are structured like ZIP files, you can rename an EPUB eBook, replacing .epub with .zip, and then open the file with your favorite file compression program, like the free 7-Zip tool. Inside you should find the contents of the EPUB eBook in HTML format, as well as the images and styles used to create the EPUB file. The EPUB file format supports embedding files such as GIF, PNG, JPG, and SVG images. How to Convert an EPUB File There are several ways to convert EPUB files: Calibre is the premier program for converting an EPUB file to another format. It converts to and from most other eBook formats, including ones compatible with the Amazon Kindle. Some of the supported conversions include EPUB to FB2, HTML, LIT, LRF, MOBI, PDF, PDB, RTF, TXT, and SNB.Zamzar is another online EPUB converter worth mentioning. You can use the website to convert the EPUB file to PDF, TXT, FB2, and other similar text formats.Using the Online eBook Converter is one way to make an EPUB file from another document file like AZW or PDF. You can try to convert an EPUB file by opening it in one of the other eBook readers and choosing to save or export the open file as another file format, although this is probably not as effective as using Calibre or the online converters. If none of those methods work, check out other file conversion software programs. Still Can't Open the File? One of the most common mistakes when opening an unfamiliar file type is misreading the file extension. Although different file formats use different file extensions, they sometimes look an awful lot alike, which can be confusing when trying to open or convert one. For example, a PUB file is only one letter away from using the exact same suffix as EPUB files, but instead of being electronic publication files, they're used by Microsoft's Publisher as Publisher Document files. It's also easy to confuse an EBM file for an EPUB file. EBM files are either EXTRA! Basic Macro files or Embla Recording files, but neither format is an eBook. The first opens with Micro Focus software and the other is used by Embla RemLogic software. If you discover that your file actually isn't using the EPUB file extension, re-read it to see what the extension is and then research it on Google or here on Lifewire to learn more about what it's used for and how to open and/or convert it.