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GeSHi or Generic Syntax Highlighter is a free software library that allows syntax highlighting of source code for several markup and programming languages. The program is written in PHP and is bundled or available as an add-on in popular web-based applications, such as Dokuwiki, Drupal, Mambo, MediaWiki (see extension), phpBB and WikkaWiki. Wikipedia used GeSHi as its primary syntax highlighter until 2015.

Generic Syntax Highlighter
GeSHi screenshot.png
Developer(s)Nigel McNie, Benny Baumann
Stable release / November 3, 2014; 4 years ago (2014-11-03)
Written inPHP
Operating systemCross-platform
TypeSyntax highlighting



Among its notable features:

  • Fully CSS-driven output
  • Supports about 220 markup and programming languages
  • Extensibility via custom language files
  • XHTML 1.1 and CSS Level 2 compliance
  • Auto-caps/noncaps of keywords
  • Line numbering
  • Word wrapping
  • Automatic generation of links to programming language documentation


GeSHi was originally designed as a module to introduce syntax highlighting in the phpBB board system. Later, it was made to work without a phpBB as a stand-alone library.

After a long time of inactivity the project was handed over to Benny Baumann on March 15, 2008.

Software which utilises GeSHi to colour filesEdit

Free GeSHi WebServiceEdit

External linksEdit