LaTeX Math Viewer

Paste LaTeX math and see it render as cleanly typeset equations the moment you type. The viewer uses KaTeX — a fast, accurate math typesetting engine — to render fractions, integrals, sums, roots, matrices, Greek letters and full multi-line aligned environments, all in your browser. Blank lines separate several equations so you can preview a whole set at once, errors are flagged inline, and nothing is uploaded.

How to use the LaTeX Math Viewer

Type or paste LaTeX math into the box, load a .tex file, or click Example to see a few sample equations. Rendering happens live a moment after each edit. Write maths the way you would inside LaTeX math mode — \frac{a}{b} for fractions, \int, \sum and \sqrt{…} for integrals, sums and roots, ^ and _ for superscripts and subscripts, \alpha, \beta, \pi for Greek letters, and so on. You do not need to add dollar signs; each block is rendered in display mode automatically.

Separate equations with a blank line and each becomes its own rendered block, so you can preview a list of formulas together. A multi-line environment such as \begin{aligned} … \end{aligned} or \begin{matrix} … \end{matrix} is kept together and rendered as a single aligned unit. If an expression has a mistake — an unclosed brace, an unknown command — the status line shows the error message and the offending block is marked, while the rest of your equations still render so the page stays useful. KaTeX runs entirely in your browser, and its stylesheet and maths fonts are served from this site, so rendering works with nothing uploaded and no external requests.

LaTeX math & KaTeX rendering

LaTeX is the typesetting system that has been the standard for mathematical and scientific writing for forty years. Its greatest strength is mathematical notation: a concise, expressive syntax for expressing everything from a simple fraction to a multi-line proof, page-layout-quality and consistent. That syntax has long outgrown LaTeX documents themselves — it is how people write maths in countless other places. Markdown notes, chat tools, Jupyter notebooks, Wikipedia, Stack Exchange and discussion forums all accept LaTeX-style math, because it is the universally understood way to write an equation in plain text.

In LaTeX, maths is written in a dedicated math mode, where commands beginning with a backslash produce symbols and structures: \frac stacks a numerator over a denominator, \int and \sum produce large operators with limits attached via _ and ^, \sqrt draws a radical, and environments like aligned and matrix arrange several lines or a grid of entries. Greek letters, arrows, relations, set notation and hundreds of other symbols each have a command. Rendering this notation properly — getting the spacing, the sizing of nested fractions, the alignment of an integral's limits all correct — is a genuinely hard typography problem, which is why a real engine is needed rather than a simple find-and-replace.

KaTeX is the engine this viewer uses. Originally built by Khan Academy for fast, server-side-capable math rendering, it implements a large subset of LaTeX math and is prized for being quick and deterministic: it lays out an equation in one synchronous pass, without the reflowing that older web math renderers were known for. It ships a set of carefully designed maths fonts that mirror LaTeX's classic Computer Modern look, which is why rendered output resembles a typeset paper. Running KaTeX in the browser means you can preview LaTeX math instantly — while drafting a notebook, writing documentation, or checking that an equation copied from a paper renders the way you expect — with no LaTeX installation, no compilation step, and, here, nothing sent to any server.

Common use cases

  • Preview an equation while writing. Check that a formula for a Markdown note, notebook, or forum post renders correctly before you paste it in.
  • Verify LaTeX from a paper. Paste an expression copied from a document to confirm it is well-formed and looks the way you expect.
  • Learn LaTeX math syntax. Experiment with fractions, integrals, matrices and environments and see each change typeset immediately.
  • Render math offline and privately. Typeset equations in the browser with self-hosted fonts, with nothing uploaded and no external requests.

Frequently asked questions

Is my input uploaded anywhere?
No. KaTeX runs entirely in your browser, and its stylesheet and maths fonts are served from this site, so rendering makes no external requests. Whatever you type is typeset locally and never sent to a server.

Do I need to add dollar signs around the math?
No. Each block is rendered in display math mode automatically, so you write the expression directly — for example e^{i\pi} + 1 = 0. Separate independent equations with a blank line and each renders as its own block.

Does it handle matrices and multi-line equations?
Yes. Environments such as aligned, matrix, pmatrix, bmatrix and cases are supported and kept together as a single rendered unit, so multi-line derivations and aligned systems typeset correctly.

Why does one expression show an error in red?
KaTeX reports a problem — often an unclosed brace or an unsupported command — for that block, and the status line shows the message so you can fix it. The other expressions still render, so a single mistake does not blank the whole preview.

Is this full LaTeX or only math?
It renders LaTeX math notation via KaTeX, which covers the large majority of mathematical commands and environments. It is not a full LaTeX document compiler: prose, sections, bibliographies and page layout belong to a full LaTeX engine, whereas this focuses on typesetting equations quickly.