HTML File

What are HTML files and how to open them

Are you having problems opening a HTML file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your HTML files.

What is a HTML file?

HTML files have multiple uses, and HyperText Markup Language Document is one of them. Read more about the other uses further down the page.

HyperText Markup Language Document

HTML is an acronym for HyperText Markup Language. HTML is used to create web pages, and it is the foundation of all website content. HTML documents are made up of tags that tell browsers how to display text, images, videos, and other media on a page.

The user does not see the HTML code itself. Instead, their web browser reads the HTML and builds the web page layout displayed to the user based on the HTML content. A website visitor can see the contents of the HTML code by selecting the "View" and "Page Source" options from the menu of their Internet browser.

HTML files may also use the HTM file extension.

How to open HTML files

We have identified 11 HTML openers that are compatible with this specific type of HTML file.

Programs that open HyperText Markup Language Document files

Last updated: August 7, 2026

All known file formats using extension .HTML

While HyperText Markup Language Document is a popular type of HTML-file, we know of 5 different uses of the .HTML file extension. Different software may use files with the same extension for different types of data.

Expression Media Template

We know that one HTML format is Expression Media Template. We have not yet analyzed in detail what these files contain and what they are used for. We're working on it.

While we have not verified the apps ourselves yet, our users have suggested ten different HTML openers which you will find listed below.

IBrowse Hotlist / Bookmark

We know that one HTML format is IBrowse Hotlist / Bookmark. We have not yet analyzed in detail what these files contain and what they are used for. We're working on it.

Netscape Bookmark-file-1 Format

We know that one HTML format is Netscape Bookmark-file-1 Format. We have not yet analyzed in detail what these files contain and what they are used for. We're working on it.

Stylus Labs Write Document

Stylus Labs Write Document (.HTML) is the file format used by the Stylus Labs Write app when saving a document in its HTML+SVG mode. It saves page data (handwritten strokes, images, bookmarks, layout, etc.) in HTML for structure, and separate SVG files for each page to hold the handwriting or drawing content so that the whole document can be viewed in any modern web browser. The content includes configurable attributes like page layout, positions (offsets), dimensions, styles, and titles.

This .HTML version is one of several formats Write supports; others include .svg (uncompressed SVG), .svgz (compressed SVG), .htm (a single HTML file with embedded SVG per page), and PDF export. On platforms that support it (Android, Windows, Mac, Linux), Write users can choose "Save As" or name their document with the .html extension to use the HTML format with separate SVG pages.

Technically files in this format begin with an XHTML 1.0 Strict DOCTYPE declaration at the start of the HTML. The file declares namespaces like xmlns="http://www.w3.org/1999/xhtml", includes structure tags such as HEAD and BODY, and references per-page SVG files where the writing data resides. Signature patterns include strings such as "DTD XHTML 1.0 STRICT" and "DOCTYPE HTML PUBLIC" near the file start.

HTML opener for Windows

We have identified one HTML opener that is compatible with this specific type of HTML file.

Various apps that use files with this extension

These apps are known to open certain types of HTML files. Remember, different programs may use HTML files for different purposes, so you may need to try out a few of them to be able to open your specific file.

Help us help others

File.org helps thousands of users every day, and we would love to hear from you if you have additional information about HTML file formats, example files, or compatible programs. Please use the links below or email us at submit@file.org to discuss further.