Hypertext Markup Language

Writable

markup · also known as HTML

The HyperText Markup Language (HTML) is a markup language designed for the rendering of information via a web browser. It was originally defined as a highly simplified subset of SGML, but is now an international standard, and is maintained by the World Wide Web Consortium (W3C). A HTML document consists of nested elements, each of which may have attributes and content. The notion of a generic HTML format is used here to define HTML documents which pre-date the first formal specification (HTML 2.0), or which otherwise to do not fully conform to any formal specifications.

Identify it

Extensions	`.htm.html.xht.xhtml`
MIME types	`text/html`
PRONOM	`fmt/96`
Wikidata	`Q62626012`
Library of Congress	`fdd000475`
Apple UTI	`public.html`

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Open it

AbiWordOpen sourcereads and writes · GNU General Public License, version 2.0 or later
ConTEXTOpen sourcereads and writes · BSD licenses
DokielOpen sourcewrites · CeCILL / GNU General Public License, version 3.0 / GNU Lesser General Public License, version 3.0 / Mozilla Public License, version 2.0
GigaMeshOpen sourcewrites · GNU General Public License
GNOME PlannerOpen sourcewrites · GNU General Public License, version 2.0 or later
LaTeX2HTMLOpen sourcewrites · GNU General Public License, version 2.0
LibreOffice CalcOpen sourcereads and writes · Mozilla Public License, version 2.0
LibreOffice WriterOpen sourcereads and writes · Mozilla Public License, version 2.0
LifeLinesOpen sourcewrites · MIT License
MaqettaOpen sourcereads and writes · BSD licenses
MyNotexOpen sourcewrites · GNU General Public License, version 3.0
OpaleOpen sourcewrites · CeCILL / GNU General Public License, version 3.0 / GNU Lesser General Public License, version 3.0 / Mozilla Public License, version 2.0
OpenOffice WriterOpen sourcewrites · GNU Lesser General Public License
PandocOpen sourcereads and writes · GPL-2.0-or-later
Q141674354Open sourcereads and writes · Apache Software License 2.0 / MIT License
Q387313Open sourcewrites · GNU General Public License / GNU Lesser General Public License / Mozilla Public License
RefDBOpen sourcewrites · GNU General Public License, version 2.0
SciTEOpen sourcereads and writes · Historical Permission Notice and Disclaimer
showdownjsOpen sourcewrites · MIT License
SkoHubOpen sourcewrites · Apache Software License 2.0
TopazeOpen sourcewrites · CeCILL / GNU General Public License, version 3.0 / GNU Lesser General Public License, version 3.0 / Mozilla Public License, version 2.0
VYMOpen sourcewrites · GNU General Public License, version 2.0
DearkOpen sourcewrites · MIT License
djot.jsOpen sourcewrites · MIT License
djot.luaOpen sourcewrites · MIT License
MuPDFOpen sourcewrites · GNU Affero General Public License, version 3.0 or later
OrbadaOpen sourcewrites · GNU General Public License
PandocOpen sourcereads and writes · GNU General Public License, version 2.0
Q220993Open sourcereads and writes · GNU General Public License, version 2.0 / GNU General Public License, version 3.0
SQL Database StudioOpen sourcewrites · Common Public License
uMapOpen sourcewrites · WTFPL
vimwikiOpen sourcewrites · MIT License
WinhelpCGIOpen sourcewrites · GNU General Public License, version 2.0
AceOpen sourcereads · 3-clause BSD License
CeltxOpen sourcereads · Mozilla Public License
Cloud9 IDEOpen sourcereads · GNU General Public License, version 3.0 / freeware
ConverseenOpen sourcereads · GNU General Public License, version 3.0
geditOpen sourcereads · GNU General Public License, version 2.0 or later
gPHPeditOpen sourcereads · GNU General Public License
IntelliJ IDEAOpen sourcereads · Apache Software License 2.0 / trial

And 151 more in the JSON record.

Convert it

To	With	Fidelity	Command and losses
ePub Format	Pandoc	Partial	`pandoc -f html -t epub in.html -o out.epub` Document structure is kept; layout, styles and unsupported elements are lost.
Markdown	Pandoc	Partial	`pandoc -f html -t markdown in.html -o out.md` Document structure is kept; layout, styles and unsupported elements are lost.
Office Open XML Wordprocessing Document, ECMA-376 1st Edition	Pandoc	Partial	`pandoc -f html -t docx in.html -o out.docx` Document structure is kept; layout, styles and unsupported elements are lost.
OpenDocument	Pandoc	Partial	`pandoc -f html -t odt in.html -o out.odt` Document structure is kept; layout, styles and unsupported elements are lost.
Plain Text File	Pandoc	Partial	`pandoc -f html -t plain in.html -o out.txt` Text only: all formatting is dropped.

Sources

From Converters (FFmpeg, ImageMagick, Pandoc, LibreOffice), PRONOM, Wikidata. Updated 2026-10-20.

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