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In this article, we had analytically studied the effect of the shape and size of the mask on the machining quality of the circular feature. Machining quality was measured in the form of unmachined area'An'that will be left after machining a specific area, in the minimum machining time'Tm.'For this study, we have considered square and circular spot size (spot size is 1/10 of the mask size) of varying size, ie, from 1 mm to 10 mm and for each case, the overlap was also varied from 0.1 to 0.9. From the analytical solution, we found that the square spot is better than the circular spot for minimum machining time for given spot size, whereas for minimum unmachined area circular spot is better than the square spot. This study could be useful in the industrial-scale manufacturing of circular features using the mask projection technique in laser machining.