Windows
Compatible applications
Quick Facts
Basic information about this file format
Extension
.EPUB
File Type
Electronic Publication (EPUB) ebook
Category
Data
Best first step
Use compatible software
Quick Summary
A practical overview of the .epub file format
The EPUB (Electronic Publication) format is a widely used, open-standard ebook format optimized for reflowable text. This means the text adapts to the screen size and orientation of the reading device, providing a comfortable reading experience on various devices, from smartphones and tablets to de…
File extension
.EPUB
File type
Electronic Publication (EPUB) ebook
Category
Data
Recommended action
Open with a trusted compatible app
How to open a .epub file
Start with a trusted app that supports this format
- Check the file extension carefully and confirm that the file name really ends with .epub.
- Use software that supports this file type. If one app does not work, try another compatible program for the same platform.
- Update the application if the file was created by a newer version of the software.
- Scan files from unknown sources before opening them, especially documents, archives, scripts, installers, and executable files.
What is a .epub file?
File extension details and usage information
The EPUB (Electronic Publication) format is a widely used, open-standard ebook format optimized for reflowable text. This means the text adapts to the screen size and orientation of the reading device, providing a comfortable reading experience on various devices, from smartphones and tablets to dedicated e-readers and computers. EPUB files are essentially ZIP archives containing XHTML (or DTBook) documents for the text content, CSS stylesheets for formatting, images, and metadata describing the book (title, author, publisher, etc.). The format supports features like embedded fonts, vector graphics, and interactive elements, making it a versatile choice for distributing ebooks. EPUB is designed to be accessible, allowing for features like text-to-speech and adjustable font sizes to cater to readers with disabilities. The open nature of the format has led to widespread adoption by publishers, retailers, and libraries, making it a dominant format in the ebook market. It is designed to be a single file format that can be used across multiple devices and platforms, unlike some older formats that were tied to specific devices or software.
Software Compatibility
Programs that may open or work with .epub files
macOS
Compatible applications
Linux
Compatible applications
Mobile
Mobile applications
Can .epub files be converted?
Options for saving or exporting this file to another format
In many cases, a .epub file can be converted by opening it in compatible software and using an option such as Save As, Export, or Convert. The available output formats depend on the file type and the application used.
- Use the original software that created the file when possible.
- Check whether the application supports exporting to common formats.
- Be careful with online converters when working with private, business, or sensitive files.
- If conversion fails, the file may be corrupted, incomplete, encrypted, or not actually a .epub file.
Why can't I open a .epub file?
Common reasons this file type may not open correctly
Wrong software
The file may require a specific program that supports the .epub format.
Incorrect extension
The file extension may have been renamed manually, even though the actual file format is different.
Corrupted file
The file may be incomplete, damaged during download, or transferred incorrectly.
Outdated app
Your software may need to be updated before it can open newer versions of this file format.
Frequently Asked Questions
Common questions about .epub files
To open a .epub file, use software that supports this file format.
- Adobe Digital Editions
- Calibre
- Sumatra PDF
- FBReader
- Icecream Ebook Reader
Open the file in compatible software and look for options such as Save As, Export, or Convert. If no export option is available, the file may require a specialized converter or the original application that created it.
- Verify that the file extension is correct.
- Install or update compatible software.
- Try another application that supports this format.
- Check whether the file is corrupted, incomplete, or encrypted.
A file extension alone does not guarantee whether a file is safe or unsafe. Only open files from trusted sources, scan unknown files before opening them, and be especially careful with executable, script, archive, and document files.
File safety tips
Use caution with unknown files
Only open files from trusted sources. Before opening a .epub file, scan it with antivirus software, verify that the file extension is expected, and avoid running unknown executable, installer, macro-enabled document, or script files.