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EPUB file format

Extension.epub
Categorybooks
Programs
FBReader
Sumatra PDF
CoolReader
STDU Viewer
Calibre
Adobe Digital Editions
Sony reader
Comic Book Reader
QuarkXPress
DescriptionThe .epub file format is a popular eBook standard with many features. Standardized by the International Digital Publishing Forum (IDPF), the latest version is EPUB 3.2. This format's reflowable content adapts to different screen sizes, unlike the fixed layout of PDFs. The .epub format supports HTML5 and CSS3, offering flexible formatting and layouts, including fixed layouts. It integrates multimedia, like audio and video, and interactive elements. The format supports various languages, including vertical and right-to-left scripts like Japanese and Arabic. The .epub format prioritizes accessibility with screen reader compatibility. It can be protected with Digital Rights Management (DRM), but DRM-free versions are common. The format uses ZIP compression to compress the entire file, including files, images, and stylesheets.
Technical detailsThe .epub file includes metadata, such as author, title, and publisher, stored in XML. Backward compatibility, such as EPUB 3 supporting EPUB 2, ensures compatibility with older reading systems. The .epub file structure includes a manifest, navigation file, content files, and optional multimedia files. Supported by many e-readers and apps, including Amazon Kindle and Apple Books, the .epub format also supports Scalable Vector Graphics (SVG) for high-quality images and interactive elements. This adaptability, broad device compatibility, and complex layout support make it the preferred format in digital publishing. Its open standard ensures ongoing development.
MIME type
application/epub+zip