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LaTeX2WP, written by Luca Trevisan, is a Python script that will convert a LaTeX file into a format suitable for pasting into a WordPress.com post.
WordPress.com uses its customised version of LatexRender to render the snippets of LaTeX, but LaTeX2WP will help prepare long texts. LaTeX2WP takes a TeX file and reformats it adding the required HTML codes and latex tags so that you can have, for example, numbered equations and dispayed equations. This is particularly useful for long mathematical notes containing lots of mathematics. It’s used by, amongst others, the Fields medallist Terence Tao for his blog at What’s new.
You can read more about LaTeX2WP and download it from LaTeX to WordPress