>> HTMLZ file

HTMLZ file format description

Many people share .htmlz files without attaching instructions on how to use it. Yet it isn’t evident for everyone which program a .htmlz file can be edited, converted or printed with. On this page, we try to provide assistance for handling .htmlz files.

1 filename extension(s) found in our database.

.htmlz - Zipped HTML eBook

The HTMLZ ebook files are related to Calibre. HTMLZ file is a Zipped HTML eBook. A HTMLZ file may contain HTML files, text, images and metadata.opf file.

Ebook files
- / -
Zipped HTML eBook related extensions:
Calibre Device Information Data
Comic Book Collection
Sony BBeB E-Book
Sony BBeB E-Book Source
EPUB Navigation Control XML
Open Electronic Package Ebook

Naturally, other applications may also use the .htmlz file extension. Even harmful programs can create .htmlz files. Be especially cautious with .htmlz files coming from an unknown source!

Can't open a .htmlz file?

When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize a filename extension, you receive the following message:

Windows can't open this file:


To open this file, Windows needs to know what program you want to use to open it. Windows can go online to look it up automatically, or you can manually select one from a list of programs that are installed on your computer.

To avoid this error, you need to set the file association correctly.

The .htmlz file extension is often given incorrectly!

According to the searches on our site, these misspellings were the most common in the past year:

html, htmz

Is it possible that the filename extension is misspelled?

Similar file extensions in our database:

Zipped HTML eBook
Hypertext Markup Language Document

Operating systems currently supports the following operating systems:

Windows XP/Vista, Windows 7/8, Windows 10, CentOS, Debian GNU/Linux, Ubuntu Linux, FreeBSD, Mac OS X, iOS, Android

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If you have useful information about the .htmlz file format, then write to us!