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# [<img src="https://khan.github.io/KaTeX/katex-logo.svg" width="130" alt="KaTeX">](https://khan.github.io/KaTeX/) [](https://travis-ci.org/Khan/KaTeX)
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[](https://gitter.im/Khan/KaTeX?utm_source=badge&utm_medium=badge&utm_campaign=pr-badge&utm_content=badge)
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KaTeX is a fast, easy-to-use JavaScript library for TeX math rendering on the web.
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* **Fast:** KaTeX renders its math synchronously and doesn't need to reflow the page. See how it compares to a competitor in [this speed test](http://jsperf.com/katex-vs-mathjax/).
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* **Print quality:** KaTeX’s layout is based on Donald Knuth’s TeX, the gold standard for math typesetting.
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* **Self contained:** KaTeX has no dependencies and can easily be bundled with your website resources.
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* **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.
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KaTeX supports all major browsers, including Chrome, Safari, Firefox, Opera, and IE 8 - IE 11. A list of supported commands can be on the [wiki](https://github.com/Khan/KaTeX/wiki/Function-Support-in-KaTeX).
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## Usage
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You can [download KaTeX](https://github.com/khan/katex/releases) and host it on your server or include the `katex.min.js` and `katex.min.css` files on your page directly from a CDN:
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```html
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<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/KaTeX/0.5.1/katex.min.css">
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<script src="https://cdnjs.cloudflare.com/ajax/libs/KaTeX/0.5.1/katex.min.js"></script>
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```
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#### In-browser rendering
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Call `katex.render` with a TeX expression and a DOM element to render into:
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```js
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katex.render("c = \\pm\\sqrt{a^2 + b^2}", element);
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```
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If KaTeX can't parse the expression, it throws a `katex.ParseError` error.
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#### Server side rendering or rendering to a string
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To generate HTML on the server or to generate an HTML string of the rendered math, you can use `katex.renderToString`:
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```js
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var html = katex.renderToString("c = \\pm\\sqrt{a^2 + b^2}");
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// '<span class="katex">...</span>'
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```
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Make sure to include the CSS and font files, but there is no need to include the JavaScript. Like `render`, `renderToString` throws if it can't parse the expression.
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#### Rendering options
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You can provide an object of options as the last argument to `katex.render` and `katex.renderToString`. Available options are:
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- `displayMode`: `boolean`. If `true` the math will be rendered in display mode, which will put the math in display style (so `\int` and `\sum` are large, for example), and will center the math on the page on its own line. If `false` the math will be rendered in inline mode. (default: `false`)
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- `throwOnError`: `boolean`. If `true`, KaTeX will throw a `ParseError` when it encounters an unsupported command. If `false`, KaTeX will render the unsupported command as text in the color given by `errorColor`. (default: `true`)
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- `errorColor`: `string`. A color string given in the format `"#XXX"` or `"#XXXXXX"`. This option determines the color which unsupported commands are rendered in. (default: `#cc0000`)
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For example:
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```js
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katex.render("c = \\pm\\sqrt{a^2 + b^2}", element, { displayMode: true });
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```
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#### Automatic rendering of math on a page
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Math on the page can be automatically rendered using the auto-render extension. See [the Auto-render README](contrib/auto-render/README.md) for more information.
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## Contributing
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See [CONTRIBUTING.md](CONTRIBUTING.md)
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## License
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KaTeX is licensed under the [MIT License](http://opensource.org/licenses/MIT).
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