KaTeX is a lightweight and easy-to-use JavaScript library for presenting mathematical formulas on web pages. It renders mathematical formulas instantly without slowing down page loads, and generates professional-grade typography based on the mathematical typography standard TeX. Unlike its larger counterparts, KaTeX has no dependencies, runs in all major browsers, and renders on the server before being sent to the user. This means your website loads faster while still showcasing formatted, beautiful mathematical expressions. You can use it by adding a few lines of code to your HTML, making it ideal for educational websites, technical documentation, or any web content that contains mathematical formulas.
In many technical blogs, scientific notes, or online courses, mathematical formulas are almost inevitable. From simple (E=mc^2) to complex integrals, matrices, differential equations, if they can only be expressed in ordinary text, they are not only ugly, but also almost unreadable. Therefore, how to elegantly display mathematical formulas in a web page has always been an old problem.
KaTeX is an open-source project that was born to solve this problem. It’s essentially a JavaScript library that converts LaTeX-style math formulas into math layouts that web pages can display, allowing browsers to present formulas like math textbooks.
Many people feel familiar when they first see the effects of KaTeX because its syntax comes from the TeX / LaTeX math typesetting system. Just write a formula expression like this:
frac{a}{b} = sqrt{x^2 + y^2}KaTeX renders it into a canonical mathematical layout instead of a normal text character. This approach has almost become the de facto standard for mathematical content on the Internet, whether it is a math blog, physics study notes, or technical documentation, this expression can be used directly.
KaTeX was first developed by Khan Academy . Khan Academy found that traditional web formula rendering tools are not ideal when faced with a large number of formulas, and page loading and rendering will be slower. So they developed KaTeX with a clear goal: to render mathematical formulas faster and lighter on the web.
Compared to another common tool , MathJax , KaTeX’s biggest feature is speed. It uses pre-compiled parsing to quickly convert formulas into HTML and CSS structures, rather than performing complex dynamic layout calculations in the browser. For pages with a large number of formulas, this method can significantly reduce rendering time and make page scrolling and loading smoother.
In addition to speed, another advantage of KaTeX is its simplicity. It’s not complicated to use, just introduce two lines of resource files into the web page, and then write a little JavaScript code to render the LaTeX formula into the page. This is very friendly for blogging systems, documentation websites, or study notes. Many Markdown systems also support KaTeX outright, so there is little to no additional configuration required when writing technical articles.
KaTeX also has a very useful capability, which is to support server-side rendering. Developers can convert mathematical formulas to HTML in advance in the Node.js environment and send the formatted content to the browser. This method not only reduces the browser’s rendering burden but also allows the page to display formula content faster, which is very useful for large documentation sites or educational platforms.
From the perspective of application scenarios, KaTeX covers almost all web content that requires mathematical formulas. Educational websites can use it to showcase mathematical and physics formulas, technical blogs can use it to write about derivation processes, and online documentation systems can use it to document algorithms and formula derivations. Even some scientific computing notes and research record websites use KaTeX to present mathematical expressions.
From the perspective of the open source community, KaTeX has also become one of the important tools for modern web mathematical typography. It’s lightweight, fast, and doesn’t rely on a complex runtime environment, so it will work as long as your browser supports basic JavaScript. It’s an almost out-of-the-box solution for developers looking to showcase math content on their web pages.
If LaTeX makes for elegant mathematical typography for academic papers, KaTeX brings that typography to the web world. With just a few lines of code, an ordinary web page can have a clear and beautiful formula display effect as a math textbook. This is why more and more technology websites, educational platforms, and knowledge blogs are choosing to use KaTeX.
Github：https://github.com/KaTeX/KaTeX
Tubing: