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HTMLZ file extension

The table below provides useful information about the .htmlz file extension. It answers questions such as:

  • What is the .htmlz file?
  • What program do I need to open a .htmlz file?
  • How can the .htmlz file be opened, edited or printed?
  • How can I convert .htmlz files to another format?

We hope you find this page helpful and a valuable resource!

1 extension(s) and 0 alias(es) found in database

✅ Zipped HTML eBook

HTMLZ file is a Zipped HTML eBook. A HTMLZ file may contain HTML files, text, images and metadata.opf file.
HTMLZ format description not yet available
Category: Ebook files
Application: Calibre
Mime-type: application/octet-stream
Magic number: -
Magic string: -
Sample: -
HTMLZ aliases:
HTMLZ related links:
HTMLZ related extensions:
Mobipocket Reader E-Book

Amazon Kindle eBook

Open eBook Document

ZIP Compressed Text Ebook

Amazon Kindle Active Content App

Amazon Kindle eBook Info

Amazon Kindle Data

Amazon Kindle Newspaper Data

Other types of files may also use the .htmlz file extension.

🔄 .htmlz converters

The following softwares are capable of converting .htmlz files to other formats:


For example, using the softwares above, a .htmlz file can be converted into one of the following formats:

txtz, odt, prc, mobi, rb, cbz, cbr, rtf, fb2, djvu, snb, pml, tcr, pdb, cbc

🚫 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?

We found the following similar file extensions in our database:

Hypertext Markup Language Document
Zipped HTML eBook

🔴 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 cannot open this file:


To open this file, Windows needs to know what program you want to use to open it...

If you don't know how to set the .htmlz file association, check the FAQ.

🔴 Can I change the extension of files?

Changing the filename extension of a file is not a good idea. When you change a file's extension, you change the way programs on your computer read the file. The problem is, changing the file extension does not change the file format.

If you have helpful information about the .htmlz file extension, write to us!

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