According to NACE International, the global cost generated by corrosion is about US$ 2.5 trillion and up to 35% could be saved by using corrosion control practices[1]. However, the correct choice of the method to control the corrosion it is tied to the knowledge of how the process happens. In this aspect, the pitting corrosion on stainless surfaces is extremely worrying. This kind of corrosion is a localized form which cavities are produced in the materials, but it is more difficult to detect, predict and avoid or minimize. Here is proposed a new and cheap methodology to study the tridimensional format of the pitting corrosion using reconstruction of segmented images. The pitting were produced by polarization of stainless steel AISI 304 at 0.46 V (vs Ag/AgCl/KCl satured) into 0.1 mol L^-1 HCl during 10 minutes at 25 °C. Afterwards, the samples were cut, washed with pure water, dried and immersed into resin keeping the plane of surface in a perpendicular direction to the base of resin block. Next, the resin block was polished using sandpaper (mesh 2000) and alumina slurry (1 μm). Every 8 μm of scraping one optical microscopy image of the surface-bulk of the sample was taken. This procedure allowed a side view of the pitting detailing its shape and extension. Finally, the segmented images were reconstructed in a tridimensional one, which shows in detail the shape and extension of each pitting in the surface of stainless steel. Now, the distribution of pitting and its shape variation could be related to the other physical and chemical signals monitored during the pitting formation, as current intensity or chemical composition. This methodology, although destructive, is easily applicable and allows to evaluate in an inexpensive and reproducible way the pitting formation.