This chapter focuses on a modern characterization technique, Atomic Force Microscopy (AFM), which uses nanoprobes to extract three-dimensional (3-D) images of surfaces. These 3-D images contain both qualitative and quantitative information. Qualitative information is useful for visually understand the differences between various adsorbents that influence the physical properties. Quantitative information is suitable for determining roughness, shape, and depth of surface pores, pore size distribution, etc. However, it is quite challenging to take images of highly coarse surfaces like the porous materials usually have. Each of the materials requires different techniques for image extraction. Therefore, this work contains a brief description of the image extraction techniques for various porous materials with quantitative analysis.