I was working on a presentation and had to place several logos at the end of a slide. Initially, I just added them using includegraphics. However, it looked terrible because each logo was of a different size. Obviously, I wanted to arrange them at least half-decently. For that, I aligned them vertically and added some space between each logo.
Vertical alignment
Here, the adjustbox package, together with graphicx, provides a handy solution. The option valign=c (center) worked nicely in my case. In another case, valign=t (top) might look better.
%Preamble
\usepackage[export]{adjustbox}
%Document
\includegraphics[width=2cm,valign=c]{logo1}
Horizontal alignment
To align the logos horizontally, I added \hfill commands between each figure. This will divide whitespace equally between figures.
\includegraphics{logo1}\hfill\includegraphics{logo2}
An additional \hfill before and after adds extra space to the left and right of the logo chain.
Complete code example
\documentclass[11pt]{article}
\usepackage[export]{adjustbox}
\begin{document}
\hfill\includegraphics[width=2cm,valign=c]{logo1}
\hfill\includegraphics[width=2cm, valign=c]{logo2}
\hfill\includegraphics[width=2cm, valign=c]{logo3}
\hfill\includegraphics[width=2cm, valign=c]{logo4}\hspace*{\fill}
\end{document}