epub

.epub — Electronic Publication

International Digital Publishing Forum (IDPF) · 2007

Developer

International Digital Publishing Forum (IDPF)

What is a .epub file?

An EPUB file is an e-book file format that contains text, images, and other content, designed to be reflowable and adaptable to various screen sizes. It is the most widely supported vendor-independent XML-based e-book format, recognized by nearly all e-readers and software. EPUB files are essentially ZIP archives containing web standards like XHTML, CSS, and SVG.

Programs That Open .epub Files

Platform	Program
Windows	Calibre	Free
	Adobe Digital Editions	Free	Official
	Thorium Reader	Free
macOS	Apple Books	Free	Official
	Calibre	Free
	Adobe Digital Editions	Free	Official

Common Problems with .epub Files

⚠️ EPUB file won't open or displays incorrectly.

Ensure you have a compatible e-reader application installed, such as Calibre, Adobe Digital Editions, or your device's native e-reader. Try opening the file in a different program, as some EPUBs might have specific formatting or DRM.

⚠️ EPUB content is not reflowing properly or images are missing.

This can sometimes happen with older EPUB versions or improperly created files. Update your e-reader software to the latest version. If possible, try converting the EPUB to itself using a tool like Calibre to fix potential internal errors.

⚠️ Unable to transfer EPUB files to my e-reader device.

Connect your e-reader to your computer and use its dedicated transfer software (if any) or a program like Calibre, which provides excellent device management. Ensure the EPUB is not DRM-protected if you're attempting to transfer it to a device not authorized for that DRM.

Frequently Asked Questions

What is the difference between EPUB and PDF?▼

EPUB files are designed to be 'reflowable,' meaning the text and images adjust dynamically to fit different screen sizes and orientations, offering a flexible reading experience. PDF files are fixed-layout, preserving the exact design and formatting regardless of the device, which is ideal for documents where precise visual representation is critical.

Can EPUB files contain DRM (Digital Rights Management)?▼

Yes, while EPUB is an open standard, publishers can apply DRM to EPUB files to prevent unauthorized copying and distribution. Adobe Digital Editions DRM is a common method used for EPUBs, requiring authorization of the reading device or software.

How can I create an EPUB file?▼

You can create EPUB files using various tools. Dedicated e-book creation software like Calibre allows you to convert other formats to EPUB. Word processors like Scrivener also have EPUB export capabilities, and more advanced users might use tools like Sigil for direct EPUB editing.

Technical Details

EPUB files are structured as a ZIP archive, containing XHTML content documents, CSS stylesheets, images, and a manifest file (OPF) describing the book's components. The magic bytes for an EPUB file are typically the standard ZIP archive signature (PK\x03\x04), with an additional `mimetype` file at the root containing `application/epub+zip`.

Did You Know?

The EPUB standard superseded the Open eBook (OEB) format, building upon its XML-based structure to create a more robust and widely adopted e-book format.

Security Information

EPUB files are generally safe to open as they are essentially ZIP archives. However, like any file downloaded from the internet, always obtain EPUBs from trusted sources. Malicious actors could embed harmful scripts or links, though this is less common than with executable files.