EPUB & Ebook Viewers
Cbr Viewer
Open and read CBR comic book files online. Supports manga right-to-left mode, page thumbnails, zoom, and two-page spread. Free, private, works on any device.
Cbz Viewer
Open CBZ comic book archives in your browser. Thumbnail navigation, zoom, and right-to-left manga mode. No install required—works on desktop and mobile devices.
Epub Viewer
View EPUB metadata, table of contents, cover image, and file structure. Extract title, author, ISBN, word count. Private, no uploads to servers.
Mobi Viewer
View MOBI ebook files in your browser. Read Amazon Kindle format books without Kindle app. Private, browser-based reader.
Understanding EPUB Files
EPUB (Electronic Publication) is the open standard format for ebooks. Unlike PDF, EPUB content is reflowable—text adapts to different screen sizes and font preferences. An EPUB is essentially a ZIP archive containing XHTML, CSS, images, and metadata files structured according to specifications.
EPUB Structure
Every EPUB contains several key components: the OPF (Open Packaging Format) file stores metadata like title, author, and ISBN; the NCX or navigation document defines the table of contents; content files contain the actual book text in XHTML; and the manifest lists all files included in the ebook.
Metadata Inspection
Our viewer extracts complete metadata from EPUB files including bibliographic information (title, author, publisher, ISBN), technical details (language, unique identifier, publication date), and structural information (word count, chapter count, file composition). This is useful for publishers managing catalogs, librarians organizing collections, and authors verifying exported files.
Privacy and Compatibility
All EPUB processing happens in your browser using JSZip to parse the archive. Your ebook files never leave your device. The viewer supports both EPUB 2 (using NCX navigation) and EPUB 3 (using HTML5 nav elements) formats.
Use Cases
- Publishers: Verify metadata before distribution, check file structure for errors
- Librarians: Catalog books, extract ISBN and bibliographic data
- Authors: Preview exported ebooks, verify TOC and metadata
- Developers: Debug EPUB generation, inspect file structure