This study aimed mainly at recycling office paper waste to develop a new paper by exploiting different defibering methods, including the use of seawater to overcome the lack of tap water resources. The study results of the difference between recycled fibers defibered by seawater and tap water with a 2-sample test did not show significant differences in fiber dimensions. However, the result proves the possibility of replacing tap water with seawater to improve water resource management, in order to save precious water resources and reduce costs. And paves the way for the need to strengthen these papers impacted by recycling and defibering.