An analysis of edge effects in planar capacitors with parallel electrodes is presented in this article. Many electronic applications utilize capacitors, and understanding the phenomena around their edges is crucial to their design and optimization. Our research explores in detail the distribution of electric fields and electric potential near electrodes using models and methods based on Maxwell's principles and Gauss's theorem. Divergent electric fields can create edge effects, which affect capacitor performance by creating edge effects. A circular electrode shape is one of the strategies we present to mitigate these effects. The implications of these findings in the field of electronics and related technologies are discussed in the final section.