HTMLZ: conversion steps
- Upload your HTMLZ file to start.
- Convert HTMLZ to AZW3.
- Download the HTMLZ file.
About HTMLZ files
a book as one HTML page, packed in a ZIP
HTMLZ is Calibre's format for a book as a single HTML page with its CSS and images, packed in a ZIP file.
Editing the text of a book in an HTML editor, or publishing it as a web page.
HTMLZ: what conversion changes
Converting HTMLZ reflows layout.
HTMLZ: settings to change
Before you convert HTMLZ files, you can adjust: Title, Author, Language, Page size, Base font size, and Generate table of contents.
Limits of the HTMLZ format
Few readers open HTMLZ directly; it is mainly an exchange format for Calibre.
Common questions about HTMLZ
Why won’t any e-reader open my HTMLZ book directly? It is a whole web page zipped into one file, a storage format no reader unpacks — converting to EPUB gives the book the structure readers actually display.
Why convert an ebook to HTMLZ? As a compact archive copy that any browser can open once unzipped, preserving structure without a reader app.