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Free LaTeX Equation Editor & Renderer
A free, private LaTeX equation editor that renders TeX math entirely in your browser. It is powered by KaTeX (KaTeX/KaTeX), in the projects own words "a fast, easy-to-use JavaScript library for TeX math rendering on the web" whose layout is "based on Donald Knuth's TeX, the gold standard for math typesetting." Type LaTeX into the source box and a debounced live preview renders the equation synchronously, the same approach KaTeX uses in production on Khan Academy, GitHub, Discord, and thousands of other sites. Toggle between display mode (a centered block equation) and inline mode (text-flow size) to match how the formula will appear in your document. A grouped symbol palette lets you insert common structures with one click: fractions \frac{a}{b}, square and nth roots, superscripts and subscripts, big operators like \sum, \prod, \int and \lim, the full Greek alphabet, relations and arrows, and ready-made matrix, cases, and aligned environments. Five sample equations (the quadratic formula, the Gaussian integral, Euler's identity, a matrix equation, and the Basel sum) load instantly so you can see real output and learn the syntax. KaTeX renders math synchronously without reflowing the page and produces the same output across Chrome, Safari, Firefox, Opera, and Edge, so the preview you see is the preview everyone sees. When a parse error occurs, throwOnError surfaces the exact KaTeX error message in red while a best-effort preview still shows the rest of the expression. Export your work three ways: copy the raw LaTeX source, copy the rendered HTML span markup that KaTeX produces, or copy clean MathML for accessible documents and tools that consume it. KaTeX has no dependencies and runs locally, so nothing you type is ever uploaded: there is no account, no API key, and no tracking.
Free and provided as is, without warranty. Use at your own risk. Terms
Write and render LaTeX math, powered by KaTeX
This editor turns LaTeX source into beautifully typeset math right inside your browser. It is built on KaTeX, which the project describes as "a fast, easy-to-use JavaScript library for TeX math rendering on the web" with a layout "based on Donald Knuth's TeX, the gold standard for math typesetting." That means there is nothing to install and no account to create: type an expression, or load one of the built-in samples, and your equation appears instantly in the live preview.
KaTeX renders math synchronously and does not reflow the page, the performance characteristic that has made it the math engine behind Khan Academy, GitHub, Discord, and countless documentation sites. Because KaTeX produces the same output regardless of browser or environment, the preview you see in Chrome is identical to what readers see in Safari, Firefox, Opera, or Edge. A debounced input keeps the preview responsive even as you type long expressions, and a grouped symbol palette inserts fractions, roots, sums, integrals, Greek letters, relations, and full matrix, cases, and aligned environments with a single click.
Display vs inline, errors, and three ways to export
Use the display and inline toggle, which maps to KaTeX displayMode, to preview your formula exactly as it will sit in a document: a centered block equation with large operators and stacked limits, or a compact inline version that flows inside a sentence. Because KaTeX runs with throwOnError enabled, a mistyped command or unbalanced brace surfaces the exact KaTeX parse error in red instead of silently rendering something wrong, while a best-effort preview still shows the parts it could parse so you can keep working.
When the equation looks right, export it three ways. Copy LaTeX hands you the raw source for Overleaf, markdown, or any LaTeX-aware editor. Copy rendered HTML gives you the KaTeX span markup to embed in a web page that already loads the KaTeX stylesheet. Copy MathML produces standards-based markup that is ideal for accessibility and for tools that consume MathML, with no dependency on the KaTeX CSS or web fonts.
Private by design: nothing leaves your browser
Unlike server-rendered equation services that send your input away to generate an image, this tool renders everything locally using the open-source KaTeX library, which is released under the MIT License (Copyright Khan Academy and other contributors). KaTeX has no dependencies and ships as a self-contained bundle, so the LaTeX you type and the HTML or MathML you copy never leave your device and are never logged or stored remotely.
KaTeX also runs here with its trust option set to false, the safe default, which means it will not execute commands that could touch the DOM or load external resources, so the rendered output is safe to display. You can verify the privacy claim at any time by opening the Network tab in your browser DevTools while editing: after the KaTeX library and fonts load once, you will see no request carrying your LaTeX or the rendered equation.
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Who actually types LaTeX day to day
Students working through a problem set draft an equation here to check it renders the way they intend before committing it to a homework document, and researchers sketch a formula for a paper draft, testing the syntax quickly before pasting the final version into Overleaf or a full LaTeX document. Teachers building worksheets or exam questions use the live preview to confirm a formula reads correctly without recompiling an entire LaTeX document just to check one equation.
It also gets heavy use from anyone posting on a site that renders LaTeX, Stack Exchange's math sites, Reddit communities with MathJax enabled, Discord servers with a KaTeX bot, since testing the syntax here first avoids posting a broken equation and having to edit it after the fact.
KaTeX vs MathJax vs a word processor equation editor
MathJax supports a broader slice of LaTeX, including more packages and some full-document features, but that breadth comes at a real speed cost, MathJax's own benchmarks and years of community reporting consistently show KaTeX rendering many times faster, which is exactly why Khan Academy built KaTeX in the first place for a platform serving equations to millions of students. For the overwhelming majority of single-equation use cases, homework, papers, forum posts, KaTeX's coverage is more than sufficient, and the speed difference is noticeable the moment you are typing and watching a live preview update.
Word processor equation editors (Microsoft Word's equation tool, Google Docs) are the easiest entry point for someone who has never seen LaTeX syntax, using a point-and-click interface instead of typed commands, but the output does not travel: a Word equation cannot be pasted as text into a paper submission system or a Stack Exchange post the way LaTeX source can. Learning the LaTeX syntax once here pays off across every one of those contexts, since the same \frac{a}{b} works everywhere LaTeX or KaTeX is understood.
Beginner mistakes that break a LaTeX equation
Forgetting curly braces around a multi-character argument is the single most common error: x^10 renders the 1 as the exponent and drops the 0 to normal size, because LaTeX only takes the next single character after ^ or _ unless you wrap the whole thing in braces, x^{10} is what actually raises x to the tenth power. The same rule trips people up with \frac, which takes exactly two arguments in a fixed order, numerator then denominator, so \frac{a}{b} is a over b, not the reverse, and forgetting one pair of braces shifts every argument after it.
Using a plain asterisk or the letter x for multiplication is another common habit carried over from everyday typing, LaTeX has dedicated commands, \times or \cdot, for these symbols, and typing a literal * or x renders as exactly that character rather than a proper multiplication sign. When the red error message appears in this editor, it is almost always one of these three: a missing brace, a wrong argument count for a command like \frac or \sqrt, or a command name that does not exist in KaTeX's supported set.
How It Works
Type or paste LaTeX into the source box, or load one of the built-in sample equations, and watch the debounced live preview render the math instantly with KaTeX.
Use the grouped symbol palette to click in fractions, roots, big operators, Greek letters, relations, and matrix or cases environments, and toggle between display and inline rendering modes.
Copy the result as raw LaTeX source, as KaTeX-rendered HTML markup, or as clean MathML, ready to paste into a document, web page, or accessibility-focused tool.
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Key Features
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Use Cases
Limitations
- KaTeX supports much, but not all, of LaTeX: some packages, exotic commands, and full document features such as \usepackage, custom macros at scale, or tikz diagrams are not available, this is a math typesetting engine, not a full LaTeX compiler
- This tool renders single math expressions, not entire LaTeX documents: there is no page layout, bibliography, sectioning, or PDF export
- Rendered HTML relies on the KaTeX CSS and web fonts, so to display copied HTML elsewhere you must also load the matching KaTeX stylesheet, MathML output does not have that dependency
- The page and the KaTeX library and fonts must load once before rendering works, so the very first visit needs a network connection, after that editing works without further requests
Frequently Asked Questions
Is this LaTeX equation editor free?
Yes, it is completely free with no usage limits. You can write, render, and copy as many equations as you like without paying, signing up, or installing anything. It is built on KaTeX, an open-source library released under the MIT License, so both the editor and its rendering engine are free to use and free to inspect.
Is my LaTeX sent to a server when I render an equation?
No. The entire equation is rendered on your device inside the browser using the KaTeX JavaScript engine. The LaTeX you type and the HTML or MathML you copy never leave your machine, are not uploaded, and are not logged. You can confirm this by opening the Network tab in your browser DevTools while editing: after KaTeX and its fonts load once, you will see no requests carrying your LaTeX or the rendered output.
What is the difference between display mode and inline mode?
Display mode renders the equation as a centered block, the way a numbered equation appears on its own line in a paper, with full-size operators and limits placed above and below sums and integrals. Inline mode renders the formula at text-flow size so it fits inside a sentence, with limits placed beside operators to save vertical space. This maps directly to KaTeX displayMode, and you toggle between the two with the buttons above the editor.
How do I copy the equation into my own website or document?
There are three copy options. Copy LaTeX gives you the raw source to paste into Overleaf, a markdown file, or any LaTeX-aware editor. Copy rendered HTML gives you the KaTeX span markup to drop into a web page, but that page must also load the KaTeX stylesheet for it to look right. Copy MathML gives you standards-based markup that works in MathML-aware browsers and tools and is the best choice for accessibility, since it does not depend on the KaTeX CSS or fonts.
What does KaTeX support, and how is it different from MathJax?
KaTeX supports much, but not all, of LaTeX and many LaTeX packages, covering the math commands most people need: fractions, roots, scripts, big operators, Greek letters, relations, arrows, and matrix, cases, and aligned environments. Compared with MathJax, KaTeX is built for speed: it renders math synchronously and does not reflow the page, which is why it powers high-traffic sites. The trade-off is that KaTeX deliberately covers a focused subset of TeX rather than the full LaTeX language.
Why is my equation showing a red error message?
KaTeX runs with throwOnError enabled, so when it hits a command it cannot parse, an unbalanced brace, or an unsupported feature, it reports the exact error in red instead of silently producing wrong output. A best-effort preview of the parts it does understand is still shown below the error. Read the message, fix the highlighted command or brace, and the preview re-renders automatically.
Does it work offline and on mobile?
On mobile, yes: the layout is responsive and the editor, symbol palette, and preview work the same on phones and tablets as on desktop. For offline use, the rendering itself runs locally in your browser, but the page, the KaTeX library, and its fonts need to load once first, so you need a connection for the initial load. After that, editing and rendering require no further network access.
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