Forty-five million tonne of Indonesian crop residues representing 21% of total crop residues are openly burned annually. Giving added value to the residues was one of the solutions to reduce open burning activities and consequently mitigate the emissions. Torrefaction is one of the pretreatment processes for improving biomass properties. In this work, fast and slow torrefaction experiments (300°C-5 minutes and 250°C-45 minutes) of Indonesian rice straw, corncob and cassava stalk were conducted using static and rotating tubular reactors. The result shows that fast torrefaction gave superior solid product properties to the slow counterpart for both reactors. Furthermore, the static tubular reactor showed better performance. Blending samples did not have a significant impact on the product properties. However, blending method can help to distribute the crop residues for the whole year due to the lack of availability on seasonal time.