Jekyll
By Jekyll contributors (originated at GitHub)
Jekyll is a static site generator written in Ruby that transforms plain text files, typically written in Markdown, along with templates and layout files, into a complete set of static HTML pages that can be hosted on any web server without…
Definition
Jekyll is a static site generator written in Ruby that transforms plain text files, typically written in Markdown, along with templates and layout files, into a complete set of static HTML pages that can be hosted on any web server without a database or server-side application logic. It is closely associated with GitHub Pages, which uses Jekyll natively to build and host sites directly from a GitHub repository.
Overview
Jekyll addresses the problem of building and maintaining a content-driven website, such as a blog or documentation site, without the operational overhead of running a dynamic content management system with a database and server-side rendering on every request. Instead of generating pages dynamically each time a visitor requests them, Jekyll precompiles all content into static HTML files during a build step, which can then be served extremely quickly and cheaply from any static file host or content delivery network. Mechanically, Jekyll takes a source directory containing Markdown or HTML content files, each with a YAML front matter block specifying metadata like title, date, and layout, and combines them with Liquid templates that define the surrounding page structure. During the build process, Jekyll parses the front matter, converts Markdown content to HTML, injects it into the specified Liquid layout, and writes the resulting static HTML file to an output directory, repeating this process for every post, page, and collection defined in the site. Jekyll also supports plugins, written in Ruby, that can extend this pipeline with custom data processing, tag generation, or additional output formats. Jekyll differs from dynamic content management systems like WordPress by producing entirely static output ahead of time rather than rendering pages on each request from a database, which removes the need for server-side application code and database administration in production but also means content changes require rebuilding and redeploying the site. Among static site generators, Jekyll differs from Node.js-based tools like Hexo or Docusaurus by being built in Ruby and using the Liquid templating language, and from newer generators by having a comparatively simpler, less component-oriented templating model that predates the rise of JavaScript framework-based static site generators. In practice, Jekyll is most commonly used for personal blogs, project documentation sites, and portfolio pages, particularly ones hosted through GitHub Pages, which builds and deploys Jekyll sites automatically from a repository without requiring a separate build pipeline to be configured by the site owner. Its plain-text, Markdown-based authoring workflow appeals to developers who want to write content in a text editor and manage it under version control alongside code, rather than through a database-backed admin interface. The main trade-off with Jekyll is that its Ruby-based build process and Liquid templating can feel dated or comparatively limited next to newer, JavaScript-based static site generators that offer component-based templating, live reloading, and richer plugin ecosystems built around the npm package registry. Build times can also grow considerably for very large sites with thousands of pages, since Jekyll's default build process is largely single-threaded. Teams already working primarily in JavaScript, or that want React or Vue-based templating, generally find a JavaScript-native static site generator a more natural fit than Jekyll.
Key Features
- Converts Markdown content with YAML front matter into static HTML pages
- Liquid templating language for defining reusable page layouts
- Native, zero-configuration integration with GitHub Pages hosting
- Ruby-based plugin system for extending the build pipeline
- Support for collections, categories, and tags for organizing content
- No database or server-side application logic required at runtime
- Built-in support for blog-style permalinks, pagination, and feeds
- Produces fully static output deployable to any web server or CDN