EPUB Guides
Practical explanations for opening, inspecting, editing, extracting, and preparing EPUB files.
How to Convert EPUB to Markdown
Extract DRM-free EPUB chapters into structured Markdown with headings, links, metadata, and local image references.
How to Edit EPUB Metadata
Change an EPUB title, authors, language, publisher, description, identifiers, and subjects locally without rebuilding the book.
How to Open an EPUB File
Open and read a DRM-free EPUB in a browser, understand common compatibility limits, and avoid unnecessary ebook uploads.
What Is an EPUB File?
Learn how EPUB files package XHTML, CSS, images, navigation, metadata, and reading order into a flexible ebook format.
Learn how EPUB packages work and how to complete common ebook tasks without creating duplicate tool pages.
Understand the EPUB package
An EPUB is a ZIP-based publication made from web documents and package metadata.
- The package document defines metadata, manifest resources, and reading order.
- EPUB 2 commonly uses NCX navigation; EPUB 3 uses an HTML navigation document.
- Publication content should be treated as untrusted web content.
Choose the right tool page
Tool pages target direct tasks; guides explain the format and decision process.
- Use the Viewer when you need to open or read an EPUB online.
- Use Metadata or Cover Editor for narrow, non-destructive changes.
- Use Markdown or TXT extraction for portable local content.
Prepare files responsibly
Browser checks and previews are useful, but publishing still needs formal review.
- Only process DRM-free files you have the right to use.
- Keep the original EPUB and review every downloaded result.
- Run official EPUBCheck before final distribution.