Online Editor

QQbot Usage

1. Copy and paste the entire code block below into the online editor above.
2. Replace <正文> with the LaTeX code you want to enter.
3. In a QQ group where the QQ account 996533295 has been added, send the following code as a reply.

latex
/latex

<正文>

Using It on a Website

1. Edit your LaTeX in the online editor above and preview the result in SVG Preview.
2. Copy the URL shown under Image URL and insert it into your website.

• To insert it in Markdown:

Markdown
![Your image name](Image URL)

• To insert it in HTML:

html
<!-- Insert an online image and specify its dimensions -->
<img src="Image URL" alt="Text description of the image" width="300" height="200">

<!-- Insert another image with responsive sizing -->
<img src="Image URL" alt="Text description of the image" style="max-width: 100%; height: auto;">

You can also center the image horizontally:

html
<div align="center">
    <img src="Image URL" alt="Text description of the image">
</div>

Examples

Integrals, Square Roots, and Boxes

latex
\boxed{
  \int\limits_{-\infty}^{\infty}
  e^{-x^2} \, dx = \sqrt{\pi}
}

Limits and Sums

latex
\gamma \overset{\text{def}}{=}
\lim\limits_{n \to \infty}
  \left(
     \sum\limits_{k=1}^n {1 \over k}
     - \ln n
  \right)
\approx 0.577

Multiline Equations

latex
\begin{align*}
 y &= x^4 + 4\\
   &= (x^2+2)^2 - 4x^2\\
   &\leqslant (x^2+2)^2
\end{align*}

Matrices

latex
A_{m,n} = \begin{pmatrix}
a_{1,1} & a_{1,2} & \cdots & a_{1,n} \\
a_{2,1} & a_{2,2} & \cdots & a_{2,n} \\
\vdots  & \vdots  & \ddots & \vdots  \\
a_{m,1} & a_{m,2} & \cdots & a_{m,n}
\end{pmatrix}

Continued Fractions

latex
e = 2 + \cfrac{1}{
  1 + \cfrac{1}{
  2 + \cfrac{2}{
  3 + \cfrac{3}{
  4 + \cfrac{4}{\ldots}
}}}}

Picture Environment

latex
\begin{picture}(76,20)
\put(0,0){$A$}
\put(69,0){$B$}
\put(14,3){\line(1,0){50}}
\put(39,3){\vector(0,1){15}}
\put(14,3){\circle*{2}}
\put(64,3){\circle*{2}}
\end{picture}

xy-pic Diagrams

latex
\xymatrix{
  A \ar[r]^f \ar[d]_g &
  B \ar[d]^{g'} \\
  D \ar[r]_{f'} &
  C
}

TikZ Graphics

latex
\begin{tikzpicture}\small
\def\r{1.8}
\coordinate[label=$A$] (A) at (0.5*\r,0.8*\r);
\coordinate[label=below:$B$] (B) at (-\r,0);
\coordinate[label=below:$C$] (C) at (\r,0);
\draw[thin] (A) -- node[above] {$c$}
   node[pos=0.03,below,inner sep=4] {$\alpha$}
   (B) -- (C) -- node[right] {$b$} (A);
\end{tikzpicture}

TikZ Plots

latex
\begin{tikzpicture}[domain=0:2]
\draw[very thin] (-0.1,-0.1) grid (2.1,2.1);
\draw[->] (-0.2,0)--(2.2,0) node[right] {$x$};
\draw[->] (0,-0.2)--(0,2.2) node[above] {$y$};
\draw plot (\x,{sin(\x r)}) node[right] {$y=\sin x$};
\draw[color=blue] plot (\x,\x) node[right] {$y=x$};
\end{tikzpicture}