Don't count backup slides

Question

I prepare some backup slides at the end of my presentation. I don't want them to be counted in terms of pages, which is displayed at the footer of each slide.

Does anyone know how to do that?

Answer 1

For the sake of completeness, here are two solutions inspired from the link given in my above comment.

1. You can define a new counter at the end of your presentation, before your backup slides, and use this counter at the end of your backup slides to fool beamer on the total number of slides. Here is a MWE:

   \documentclass{beamer}
   
   \usepackage{beamerthemesplit}
   \usepackage{lipsum}
   \usetheme{Madrid}
   
   \newcommand{\backupbegin}{
      \newcounter{finalframe}
      \setcounter{finalframe}{\value{framenumber}}
   }
   \newcommand{\backupend}{
      \setcounter{framenumber}{\value{finalframe}}
   }
   
   \begin{document}
   % Your normal slides go here 
   \frame{\lipsum[1]}
   \frame{\lipsum[2]}
   
   \appendix
   \backupbegin
   % And your backup slides here
   \frame{\lipsum[3]}
   \backupend
   
   \end{document}
   

   In this case, the backup slide is numbered as 3/2 in this example.

2. Alternatively, you can use the appendixnumberbeamer package. MWE:

   \documentclass{beamer}
   
   \usepackage{beamerthemesplit}
   \usepackage{lipsum}
   \usetheme{Madrid}
   \usepackage{appendixnumberbeamer}
   
   \begin{document}
   % Your normal slides go here 
   \frame{\lipsum[1]}
   \frame{\lipsum[2]}
   
   \appendix
   % And your backup slides here
   \frame{\lipsum[3]}
   
   \end{document}
   

   In this case, the backup slide is numbered as 1/1.