LaTeX.org

To enter equations into LibreOffice using a LaTeX syntax, see the TexMaths plugin:
https://extensions.libreoffice.org/exte ... texmaths-1

https://latex.org/forum/viewtopic.php?f=52&t=32248 lists some options using LaTeX to generate HTML.

There is also a LaTeX equation plugin for LibreOffice, and some kind of LaTeX equation entry syntax for Word as well. Either can create HTML output.

See https://extensions.libreoffice.org ...

I have replied in a new post which summarizes the options as of today, early 2019.

As of early 2019, options include the following projects which are in active development:

The LaTeXML project is an external converter to XML which emulates low-level TeX constructs, so it works better than most other external converters.

The LaTeX TeX4ht package can generate HTML or DOC files ...

Later versions of lwarp have a nice tutorial, so if you have an older version without the tutorial then it would be worth it to download the latest version from CTAN. Also included are instructions for several ways to install lwarp.

Hi,

From the command line, enter "lwarpmk limages" to process the LaTeX images, then reload the web page to update the display.

If you remove the mathjax option, thus selecting SVG math images, then "lwarpmk html" followed by "lwarpmk limages" will create SVG images for the math as well. Recent ...

Up to v0.30.

Recent versions added improved installation directions, more tabular column types, improved footnotes and related, assistance for EPUB and word processor import, improved xindy support and indexing, and numerous packages related to footnotes and endnotes, theorems, and several others ...

v0.21 has improved support and documentation for Windows / MiKTeX. Available on CTAN.

v0.20 has major improvements in installation, ease-of-use, source compatibility, modular package management, package support, and also includes an easy tutorial.

Now available on CTAN:
http://ctan.org/pkg/lwarp

As of v0.19, lwarp supports MathJax, XeLaTeX, LuaLaTeX, mdframed, floatrow, subfloatrow, subcaption, and verse.