CriticalCSS
Extracts above-the-fold CSS from web pages to improve loading performance.
What is CriticalCSS?
CriticalCSS is a Node.js module that extracts above-the-fold CSS from web pages to optimize loading performance. It identifies the minimal CSS required to render the initial viewport content, allowing developers to inline this critical CSS and defer non-essential styles. This reduces render-blocking requests and speeds up perceived page load times.
Frontend developers and performance engineers focused on improving website loading speed and Core Web Vitals, particularly those working on static sites or build pipelines where CSS optimization is critical.
Developers choose CriticalCSS for its straightforward approach to extracting critical CSS directly from live pages or local files, with configurable viewport settings and options to force-include specific selectors. It integrates easily into Node.js build processes and provides a CLI for automation.
Overview
Finds the Above the Fold CSS for your page, and outputs it into a file
Use Cases
Best For
- Optimizing First Contentful Paint (FCP) by inlining critical CSS
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