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The paper soap is an innovation in making soap. The form of paper soap is unique like thin sheets paper. The addition of natural compounds such as virgin coconut oil (VCO) and whey kefir in soap making could improve the quality of paper soap as herbal product. This research aims to determine the optimum formulation of herbal paper soap in three whey kefir mass composition 8%, 18% and 23%. The paper soap makes using a hot process with additional glycerin as a plasticizer. The characterization of herbal paper soap is using parameters tested of pH value, stability of foam, unsaponified fat, organoleptic test, and water content. The characteristic of paper soap has a thickness of 1 mm, smells good, and slightly yellowish. The best herbal paper soap is obtained for a composition of 8% with water content, unsaponified fat, pH, and foam stability 28%, 0.39%, 8 and 83% respectively. Therefore, the herbal paper soap with whey kefir of 8% has complied SNI no. 3532-2016 standard. [ABSTRACT FROM AUTHOR]