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HTMLZ — Zipped HTML eBook
HTMLZ is Calibre's zipped HTML e-book: the book as one HTML file with its images and stylesheet in a ZIP archive.
Calibre uses HTMLZ to export a book as plain web content, easy to edit or publish. Inside are index.html, a stylesheet, images and metadata.
E-readers do not open HTMLZ. Converting to EPUB or PDF makes it readable anywhere.