# Convert pdf image to png. TiKZ

I'm making a small automata with TiKZ and I need to convert it to a png without having all the empty space around. Right now I get a whole page but I only want the automata.

I have followed the instructions from this link but I couldn't make it work. Compile a LaTeX document into a PNG image that's as short as possible

My original code:

  \documentclass{article}

\usepackage{tikz}
\usetikzlibrary{automata,positioning}

\begin{document}
\begin{tikzpicture}[shorten >=1pt,node distance=6cm,on grid,auto]

\node[state,initial] (q_0)   {$q_0$};
\node[state,accepting](q_3) [right=of q_0] {$q_3$};

\path[->]
(q_0) edge              node {bb+(a+ba)(ab)*(a+bb)} (q_3);

\end{tikzpicture}
\end{document}

• Note that the link uses the standalone class, while you're just using article. Add \pagestyle{empty} to your preamble, followed by a pdfcrop call and use the suggested ImageMagik convert sequence to take the output PDF into PNG. – Werner Jul 17 '14 at 21:22

## 1 Answer

You can use the standalone class with tikz option.

  \documentclass[tikz]{standalone}

\usetikzlibrary{automata,positioning}

\begin{document}
\begin{tikzpicture}[shorten >=1pt,node distance=6cm,on grid,auto]

\node[state,initial] (q_0)   {$q_0$};
\node[state,accepting](q_3) [right=of q_0] {$q_3$};

\path[->]
(q_0) edge              node {bb+(a+ba)(ab)*(a+bb)} (q_3);

\end{tikzpicture}
\end{document}

• Thanks. That worked but for some reason L=2 appears at the bottom of the picture. – user59272 Jul 17 '14 at 21:38
• Have you changed your example? Otherwise, this should not be able to appear. – SLx64 Jul 17 '14 at 21:40
• No it's the exact same code you gave me. Also the page-nr "1" is there as well. – user59272 Jul 17 '14 at 21:48
• I think you are doing something wrong. Copy the code from my answer and test it. There shouldn't any page numbers appear. – SLx64 Jul 17 '14 at 21:55
• I did that but now it doesn't work at all. I use this command in the terminal: convert -density 300 third.pdf -quality 200 3.png – user59272 Jul 17 '14 at 22:00