Try pandoc!

Convert   from CommonMark Creole DocBook DokuWiki FB2 Haddock markup HTML JATS 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 DokuWiki DZSlides Haddock markup HTML 4 HTML 5 ICML JATS JSON Jupyter Notebook (ipynb) LaTeX Man Ms Markdown (pandoc) Markdown (GitHub-flavored) Markdown (PHP Markdown Extra) Markdown (strict) MediaWiki MultiMarkdown Muse Native (Pandoc AST) OpenDocument OPML Org Mode Plain text reveal.js reStructuredText RTF Slideous Slidy TEI Texinfo Textile ZimWiki