How to crop frame in Beamer?

Question

I am working on some presentation with beamer. However, I need a specific frame size (not the default values of aspect ratios). What I need is to crop the frame around its content and control the padding size. For example:

\documentclass{beamer}

\beamertemplatenavigationsymbolsempty

\begin{document}
\begin{frame}
\begin{tikzpicture}

\draw (0,0) circle(3cm);

\end{tikzpicture}
\end{frame}
\end{document}

And here is what I got:

What I am looking for is to get:

Answer 1

Beamer is not meant to automatically adjust paper sizes, but two possibilities:

1. Adjust the paper size manually

   \documentclass{beamer}
   
   \geometry{papersize={8cm,8cm}}
   
   \mode<presentation>{ }
   \beamertemplatenavigationsymbolsempty
   
   \usepackage{tikz}
   
   \begin{document}
   \begin{frame}
   \centering
   \begin{tikzpicture}
   \draw (0,0) circle(3cm);
   \end{tikzpicture}
   \end{frame}
   \end{document}
   

   

2. Use another class which can automatically resize based on the content, e.g. standalone.

   \documentclass[tikz, margin=1cm]{standalone}
   
   \begin{document}
   \begin{tikzpicture}
   \draw (0,0) circle(3cm);
   \end{tikzpicture}
   \end{document}