How to Render KaTeX Math Equations in Markdown: Syntax and Setup
Render mathematical equations and LaTeX expressions in Markdown using KaTeX. Learn inline $...$ and display $$...$$ syntax, plus remark-math setup.
KaTeX is a high-performance math rendering library for the web that parses LaTeX equations into accessible HTML/CSS up to 100x faster than MathJax. Use single dollar signs ($...$) for inline equations and double dollar signs ($$...$$) for centered block formulas.
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Specification & Architecture Reference
| Equation Style | Delimiter Syntax | Visual Rendering Behavior |
|---|---|---|
| Inline Equation | $E = mc^2$ | Flows smoothly inside body text paragraphs |
| Display Block Formula | $$\sum_{i=1}^{n} i = \frac{n(n+1)}{2}$$ | Centered on its own line with generous margins |
| KaTeX CSS Requirement | katex/dist/katex.min.css | Mandatory CSS stylesheet for font glyph rendering |
Why KaTeX Replaced MathJax
For years, **MathJax** was the default choice for rendering LaTeX formulas on the web. However, MathJax's large bundle size and slower rendering can cause layout shifts on content-heavy pages.
Developed by Khan Academy, **KaTeX** compiles LaTeX formulas synchronously into lightweight HTML and CSS: - Renders up to **100x faster** than MathJax. - Zero layout shift during client page loads. - Full server-side rendering (SSR) support without requiring a browser DOM.
KaTeX Delimiter Syntax 1. **Inline Math:** Place single dollar signs around the formula: ```markdown The relative luminance is computed as $L = 0.2126R + 0.7152G + 0.0722B$. ```
- **Display Block Math:** Place double dollar signs on separate lines:
Next.js Integration via `remark-math` and `rehype-katex` ```javascript import ReactMarkdown from 'react-markdown'; import remarkMath from 'remark-math'; import rehypeKatex from 'rehype-katex'; import 'katex/dist/katex.min.css'; // Remember to import the stylesheet!
export function MathArticle({ markdownText }) { return ( <ReactMarkdown remarkPlugins={[remarkMath]} rehypePlugins={[rehypeKatex]} > {markdownText} </ReactMarkdown> ); } ```
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Frequently Asked Questions
Why do currency dollar signs ($100) trigger KaTeX parsing?
If two dollar signs appear in the same paragraph without escaping, parsers treat the intervening text as LaTeX. Escape currency figures with a backslash (\$100) to prevent unintended parsing.
Does KaTeX support chemistry formatting?
Yes, KaTeX includes support for the mhchem extension (\ce{H2O}) when configured.