{"id":1915,"date":"2025-07-05T10:04:08","date_gmt":"2025-07-05T10:04:08","guid":{"rendered":"https:\/\/www.cmsgalaxy.com\/blog\/?p=1915"},"modified":"2025-07-05T10:04:09","modified_gmt":"2025-07-05T10:04:09","slug":"wordpress-plugins-that-automatically-add-syntax-highlighting-to-existing-code-blocks","status":"publish","type":"post","link":"https:\/\/www.cmsgalaxy.com\/blog\/wordpress-plugins-that-automatically-add-syntax-highlighting-to-existing-code-blocks\/","title":{"rendered":"WordPress plugins that automatically add syntax highlighting to existing code blocks"},"content":{"rendered":"\n

there are WordPress plugins that automatically add syntax highlighting to existing code blocks<\/strong>, including those created with the default WordPress “Code” block. These plugins do not require you to use a special block or shortcode\u2014they work with the standard code blocks already present in your content<\/strong>.<\/p>\n\n\n\n

Top Plugins That Highlight Existing Code Blocks by Default<\/h2>\n\n\n\n
Plugin Name<\/th>Highlights Existing Code Blocks<\/th>Key Features<\/th><\/tr><\/thead>
Syntax-highlighting Code Block<\/strong><\/td>\u2705<\/td>Extends the core “Code” block with server-side syntax highlighting, auto-detects language, supports line numbers and line highlighting, and works with existing code blocks without extra steps.<\/td><\/tr>
SyntaxHighlighter Evolved<\/strong><\/td>\u2705<\/td>Automatically highlights code using shortcodes or its block, supports many languages, and works with both Classic and Block editors.<\/td><\/tr>
WP-Syntax<\/strong><\/td>\u2705<\/td>Uses GeSHi for highlighting, supports many languages, works with code in posts and pages, and does not interfere with other plugins.<\/td><\/tr>
WP Code Highlight<\/strong><\/td>\u2705<\/td>Provides clean syntax highlighting and a code button, works with existing code blocks.<\/td><\/tr>
PrettyCode<\/strong><\/td>\u2705<\/td>Offers syntax highlighting for 20+ languages and 50+ themes, integrates with the block editor.<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n

Highlight: Syntax-highlighting Code Block<\/h2>\n\n\n\n
    \n
  • Automatic highlighting for all standard WordPress code blocks<\/strong>\u2014no need to change your existing content.<\/li>\n\n\n\n
  • Server-side rendering<\/strong> means no JavaScript is needed on the frontend, improving performance and compatibility (including AMP support).<\/li>\n\n\n\n
  • Language auto-detection<\/strong> is built in, but you can override it per block if needed.<\/li>\n\n\n\n
  • Line numbers and highlighted lines<\/strong> are supported.<\/li>\n\n\n\n
  • Works with all languages supported by highlight.php (over 185)<\/strong>.<\/li>\n<\/ul>\n\n\n\n
    \n

    \u201cPre-existing Code blocks on a site are automatically extended to include syntax highlighting.\u201d<\/p>\n<\/blockquote>\n\n\n\n

    Other Notable Plugins<\/h2>\n\n\n\n
      \n
    • SyntaxHighlighter Evolved<\/strong>: Works with its own block or shortcodes, but is very popular and easy to use for both new and existing code.<\/li>\n\n\n\n
    • WP-Syntax<\/strong>: Simple, reliable, and works with existing code snippets.<\/li>\n<\/ul>\n\n\n\n

      How to Use<\/h2>\n\n\n\n
        \n
      • Install and activate one of these plugins (e.g., Syntax-highlighting Code Block<\/strong>).<\/li>\n\n\n\n
      • All your existing “Code” blocks will be automatically highlighted\u2014no need to edit or re-insert them<\/strong>.<\/li>\n\n\n\n
      • For advanced features (like specifying language or highlighting lines), use the block sidebar options.<\/li>\n<\/ul>\n\n\n\n

        Summary<\/h2>\n\n\n\n

        Syntax-highlighting Code Block<\/strong> is the most recommended if you want true \u201cset and forget\u201d syntax highlighting for all existing code blocks, with no need to modify your current content. Other plugins like SyntaxHighlighter Evolved<\/strong> and WP-Syntax<\/strong> also support highlighting for existing code, but may require shortcodes or specific markup in some cases.<\/p>\n\n\n\n

        If you need further customization or have a unique workflow, there are many other plugins available that can be explored in the WordPress plugin repository.<\/p>\n\n\n\n

        Add to follow-up<\/p>\n\n\n\n

        Check sources<\/p>\n\n\n\n

        SyntaxHighlighter Evolved<\/strong> does require you to use its dedicated block or shortcode for highlighting; it does not<\/strong> automatically highlight all existing WordPress “Code” blocks by default.<\/p>\n\n\n\n

        If you want a plugin that automatically highlights all existing code blocks<\/strong> (including those created with the default WordPress “Code” block, without needing to switch blocks or add special markup), use Syntax-highlighting Code Block (with Server-side Rendering)<\/strong>.<\/p>\n\n\n\n

        Why Syntax-highlighting Code Block Is the Solution<\/h2>\n\n\n\n
          \n
        • Automatic Highlighting:<\/strong> It extends the core WordPress “Code” block and automatically applies syntax highlighting to all pre-existing and new Code blocks<\/strong>\u2014no manual conversion or dedicated block needed.<\/li>\n\n\n\n
        • No JavaScript Needed:<\/strong> Highlighting is rendered on the server, so there\u2019s no frontend JavaScript and no flash of unstyled code.<\/li>\n\n\n\n
        • Language Detection:<\/strong> The plugin tries to auto-detect the language, but you can specify it in the block sidebar if you want.<\/li>\n\n\n\n
        • Performance:<\/strong> Because everything is rendered server-side, it\u2019s fast and works even with AMP or JavaScript disabled.<\/li>\n\n\n\n
        • No Content Changes Required:<\/strong> You do not<\/strong> need to edit your existing posts or change your code blocks; just install and activate the plugin.<\/li>\n<\/ul>\n\n\n\n

          How to Use<\/h2>\n\n\n\n
            \n
          1. Install and activate<\/strong> the \u201cSyntax-highlighting Code Block\u201d plugin.<\/li>\n\n\n\n
          2. All your existing and future WordPress “Code” blocks will be automatically highlighted on the frontend.<\/li>\n\n\n\n
          3. You can optionally set the language or highlight lines via the block sidebar when editing a code block.<\/li>\n<\/ol>\n\n\n\n

            In summary:<\/strong>
            If you want syntax highlighting on all standard WordPress code blocks by default, use the Syntax-highlighting Code Block<\/strong> plugin. It is designed specifically for this purpose and requires no changes to your existing content.<\/p>\n","protected":false},"excerpt":{"rendered":"

            there are WordPress plugins that automatically add syntax highlighting to existing code blocks, including those created with the default WordPress<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1915","post","type-post","status-publish","format-standard","hentry","category-uncategorized"],"_links":{"self":[{"href":"https:\/\/www.cmsgalaxy.com\/blog\/wp-json\/wp\/v2\/posts\/1915","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.cmsgalaxy.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.cmsgalaxy.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.cmsgalaxy.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.cmsgalaxy.com\/blog\/wp-json\/wp\/v2\/comments?post=1915"}],"version-history":[{"count":1,"href":"https:\/\/www.cmsgalaxy.com\/blog\/wp-json\/wp\/v2\/posts\/1915\/revisions"}],"predecessor-version":[{"id":1916,"href":"https:\/\/www.cmsgalaxy.com\/blog\/wp-json\/wp\/v2\/posts\/1915\/revisions\/1916"}],"wp:attachment":[{"href":"https:\/\/www.cmsgalaxy.com\/blog\/wp-json\/wp\/v2\/media?parent=1915"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.cmsgalaxy.com\/blog\/wp-json\/wp\/v2\/categories?post=1915"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.cmsgalaxy.com\/blog\/wp-json\/wp\/v2\/tags?post=1915"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}