EPUB Format
EPUB (Electronic Publication) is the ISO/IEC standard for digital books, maintained by the W3C. It is the native format for most e-readers (Kobo, Apple Books, most Android readers) and can be converted to Amazon's MOBI/KFX format for Kindle.
An EPUB file is a ZIP archive containing XHTML content files, a CSS stylesheet, metadata (OPF/OEB), a navigation document (TOC), and any embedded media. Each chapter is typically a separate XHTML file. This structure means that a naive text extractor will miss the hierarchy — translating an EPUB correctly requires understanding the document model, not just extracting and replacing text strings.
Translation challenges specific to EPUB include preserving the table of contents (which links to anchor IDs in content files), maintaining CSS class names and IDs that drive visual styling, handling inline elements like em and strong correctly across sentence boundaries, and preserving metadata fields (title, author, description) in both the content and the OPF file.
Key concepts
- ZIP archive containing XHTML chapters, CSS, OPF metadata, and a navigation TOC
- Table of contents links must be preserved — they reference anchor IDs in chapter files
- EPUB 2 (legacy) and EPUB 3 (current standard) have structural differences
How Vernacia uses this
Vernacia translates EPUB files with chapter structure, TOC, and metadata preserved. The output is a valid EPUB file downloadable and openable in any e-reader.
Related terms
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