EPUB Editor

The EPUB Editor provides a browser-based workflow to create, edit, and validate EPUB content without specialized desktop software. It accepts an existing EPUB or starts from a template, then exposes the content files, metadata, and structure for editing. Users can modify chapter HTML, embedded assets, and the metadata set (title, author, language, identifiers, subject, rights). It supports content editing at the HTML level and maintains asset integrity as edits proceed.
It validates against EPUB 3.x schemas and checks structural integrity, ensuring manifest items reference valid resources and that the spine order matches the reading sequence. Conceptually, it treats EPUB as a structured package: a manifest listing resources, a spine defining order, and a metadata section that drives discovery. The value lies in rapid iteration, reproducible exports, and a reduced risk of non-compliant outputs. Typical use cases include indie authors refining their ebooks, editors adjusting metadata for discovery, and small publishers preparing multiple formats for distribution. Core features include import/start-from-template, content editing, metadata management, TOC handling, asset management, preflight checks, and EPUB export. The tool emphasizes standards-compliant packaging, predictable results, and workflows that align with publishing pipelines. It is suitable for teams coordinating content across editors, designers, and QA to ensure consistency before distribution.