• Live demo • Highlights: Supports 259 languages. Mobile-friendly: does not run JavaScript. Saves bandwidth and battery compared to JavaScript-based solutions. Near-zero load on the backend. With a caching solution this does not affect your page load time at all. Line numbering. If you want to (no vertical displacements between code line and line number). Default style was tested with more than 20 themes, including Twenty Ten to Fifteen, and tweaked based on a bunch of user feedback. If you’d like to tweak the style: just provide your own CSS file. Styles are highly & easily configurable. Per-block styles: each code block on a single page can be styled on its own (if that is something you would liked to do). Clean, small and valid HTML output. Well-documented source code using modern WordPress API calls. I have maintained this plugin for several years and I plan to continue to provide support. Based on GeSHi, a reliable and well-established PHP highlighting engine, used by popular community forum applications such as phpBB or wiki applications such as Dokuwiki or MediaWiki. WP-GeSHi-Highlight works as a drop-in replacement for WP-Syntax, which does not seem to be maintained anymore (as of 2015). Make the switch, it should just work (let me know how it went)! • Usage: WordPress 5 users: for now I have tested this plugin only with the Classical Editor. Gutenberg is not yet supported (it may work though, let me know). Recommendation: use the “Text” (raw) editor. Do not use the “Visual” editor. Switching between both may corrupt the contents of your code blocks. In the text editor insert code blocks as pre blocks, and use the lang argument to define the language of the code snippet: CODE A short example for the bash language: $ dd if=/dev/zero of=image.ext3 bs=1M count=10000 oflag=append
