katex the fastest math typesetting library for the web. installation documentation view on github type an expression: % \f is defined as #1f(#2) using the macro \f\relax{x} = \int_{-\infty}^\infty \f\hat\xi\,e^{2 \pi i \xi x} \,d\xi see how it renders with katex: simple api, no dependencies – yet super fast on all major browsers. fast: katex renders its math synchronously and doesn’t need to reflow the page. print quality: katex’s layout is based on donald knuth’s tex, the gold standard for math typesetting. self contained: katex has no dependencies and can easily be bundled with your website resources. server side rendering: katex produces the same output regardless of browser or environment, so you can pre-render expressions using node.js and send them as plain html. lightning-fast