Latex tricks to reduce the number of pages of articles

• Use \vspace{-5mm} after your figures to reduce the spacing between the caption and the rest of the text. Example:

\begin{figure}
	\centering
	\includegraphics{figurename}
	\caption{Put your caption here}
	\label{fig:figlabel}
	\vspace{-5mm}
\end{figure}

• Use

   \renewcommand{\baselinestretch}{x} 

in the preamble of your document, where x is typically below 1 to save space.

• Use

   \usepackage{microtype}

• etc

See also Squeezing Space in LaTeX