The electrochemical measurements were performed in a two-electrode configuration, using a PalmSens electrochemical instrument. It is now well known that the in-depth understanding of electrochemical processes is one of the most promising avenues for the achievement of major advancements in different emerging fields for future development. In conjugation, in this work, we have developed optoelectrochemical technique than can be explored universally for visualizing different electrochemical reactions for unforeseen applications. One such example of major interest is the electrochemical water splitting process, for the production of pure hydrogen and oxygen gases. In spite of tremendous research efforts and major advancements in the field during the past decades, scarce efforts towards the visualization/imaging of the water splitting electrochemical reactions were invested. As a consequence, in this work, a universal approach for the in-situ spatiotemporal visualization of water splitting reaction under neutral water as well as neutral sea water conditions is performed (Figure ). These two systems are specifically chosen to demonstrate universality of the technique developed by showcasing the potential applicability towards pH based visualization under neutral water (Figure ) along with non Direct in-situ Spatiotemporal Visualization of Electrochemical Reactions -