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EpubCheck is a tool to validate IDPF EPUB files, version 2.0 and later. It can detect many types of errors in EPUB. OCF container structure, OPF and OPS mark-up, and internal reference consistency are checked. EpubCheck can be run as a standalone command-line tool, installed as a Java server-side web application or used as a Java library.
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Validate e-books published in .epub format by dragging and dropping onto its Dock icon or main application window....