Try pandoc!

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Convert   from CommonMark Creole DocBook DokuWiki FB2 Haddock markup HTML JATS Jira Jupyter Notebook (ipynb) LaTeX Man Markdown (pandoc) Markdown (GitHub-flavored) Markdown (PHP Markdown Extra) Markdown (strict) MediaWiki MultiMarkdown Muse Native (Pandoc AST) OPML Org Mode reStructuredText Txt2Tags Textile TikiWiki TWiki Vimwiki

to S5 AsciiDoc (original) AsciiDoc (asciidoctor-flavored) LaTeX Beamer CommonMark ConTeXt DocBook v4 DocBook v5 Docx (Word) DokuWiki DZSlides EPUB v2 EPUB v3 Haddock markup HTML 4 HTML 5 ICML JATS Jira JSON Jupyter Notebook (ipynb) LaTeX Man Ms Markdown (pandoc) Markdown (GitHub-flavored) Markdown (PHP Markdown Extra) Markdown (strict) MediaWiki MultiMarkdown Muse Native (Pandoc AST) ODT OpenDocument OPML Org Mode Plain text Powerpoint reveal.js reStructuredText RTF Slideous Slidy TEI Texinfo Textile ZimWiki Standalone (?)