MathJax is a JavaScript display engine that makes mathematical notation work across browsers, helping websites present clear, consistent equations without requiring readers to install additional software. It supports MathML, TeX, and AsciiMath input, with output options including HTML and CSS, SVG, and MathML. Its typography uses web fonts or scalable graphics rather than bitmap images, so formulas can resize with surrounding text. Accessibility features support screen readers, spoken math, zooming, navigation, and interactive exploration, while equations can also be copied into tools such as Office, LaTeX, and wikis.

Beyond its core technology, MathJax offers services for organizations preparing mathematical content for the web and ePubs. These include converting legacy documents and print materials, designing content workflows, and preparing accessible materials for online teaching and examinations. The team also provides staff training, workshops, and consultancy on accessibility, assistive technologies, system configuration, specialized fonts, and upgrades to newer MathJax versions. Its modular design can be adapted to a range of settings, from teaching resources to scientific publishing.