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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

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.


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 files[edit]

Free GeSHi WebService[edit]

External links[edit]