Free apps, built-in options and fixes for EPUB files that will not open on your computer.
Yes. EPUB is designed for eReaders and phones, but every EPUB file can be read on a Windows PC or a Mac with the right app. On a Mac the app is already installed. On Windows you will need to add a free reader, or convert the file to PDF if you prefer not to install anything.
This guide covers the simplest way to open an EPUB on each system, the best free reader apps, and what to do when a file refuses to open.
This is the easy one. Every Mac ships with Apple Books, which supports EPUB natively.
Locate the EPUB file in Finder or your Downloads folder
Double-click it — it opens in Apple Books automatically
The book is added to your library and syncs to your iPhone and iPad via iCloud
If double-clicking opens another program, right-click the file, choose Open With and select Books. Apple Books lets you change font, size, spacing and background, and keeps your reading position across devices.
Windows does not include an EPUB reader out of the box. Older versions of Microsoft Edge could open EPUB files, but Microsoft removed that feature, so you will need one of these free options:
The most complete free ebook manager for Windows. Opens EPUB, organizes your library and converts between formats. Slightly technical interface, but very powerful.
A clean, free EPUB reader from the Microsoft Store. Good for reading only, with adjustable fonts and themes. Ideal if you just want to read a book.
An open-source reader focused on accessibility and standards. Excellent EPUB 3 support and a distraction-free interface.
The official Kobo app for Windows. Reads EPUB files and syncs with a Kobo eReader if you own one.
After installing any of these, double-click your EPUB file. If Windows asks which app to use, pick the reader and tick "Always use this app" so future EPUB files open directly.
If you only need to read one file or you are on a computer where you cannot install software, the quickest route is to convert the EPUB to PDF. Every Windows PC and Mac opens PDF files without extra apps, in the browser or in the built-in viewer.
The trade-off is that a PDF has a fixed layout, so the text will not reflow to fit your window the way an EPUB does. For reading on a computer screen that is usually fine.
Tip: EPUBKit converts EPUB to PDF for free in seconds, with no signup. The file is deleted from our server after one hour.
Not reliably. Older versions of Microsoft Edge could open EPUB files, but that feature was removed. The easiest option is to install a free reader such as Calibre, or convert the EPUB to PDF and open it with any PDF viewer.
Yes. Apple Books comes pre-installed on every Mac and opens EPUB files natively. Double-click the file and it opens in Books.
The most common causes are a corrupted download, a file that is actually another format renamed to .epub, or DRM protection from a store. Try re-downloading the file or opening it with Calibre, which is very tolerant of imperfect files.
Yes. Converting the EPUB to PDF with EPUBKit produces a file that opens on any computer with no extra software, at the cost of losing the reflowable text.