Gracilaria sp. and Sargassum sp. contain growth hormones such as auxins, gibberellins, and cytokinins. A combination of them is expected to complement each other as raw material for organic fertilizers to improve soil structure and help plant growth. The purpose of this study is to determine the characteristics of organic fertilizer from different seaweed composition. Reduction the size of sample and soaking with 1% phosphoric acid solution to soften the seaweed. Homogenization and heating with the addition of molasses 3% as microbial nutrition and KOH 1% to maximalize mineral content. The fermentation process is carried out for 14 days as microbial exponential phase of Azospirilum sp as nitrogen fixation also phytohormones producer and Trichoderma sp. as an organic material decomposer. The results of ANOVA analysis and Tukey test showed that the treatment of raw material composition using different types of seaweed gives significantly different in C-Organic, nitrogen, potassium, phosphorus, pH, color, and aroma. The composition of Gracilaria sp. and Sargassum sp. give the highest value for C-Organic (1.15%) and Nitrogen (0.67), as well as phosphorus (0.45%), potassium (0.48%), and pH (4.48). Color and aroma are maturity indicators of organic fertilizers. This composition of liquid fertilizer has a pungent aroma and a dark brown color.