Abstract Production of biogas and its utilization has several environmental benefits. It is a source of renewable energy, and its production is considered and manure producing factory. Biogas has wider industrial applications for this up-gradation is desirable. Up-gradation of biogas has drawn attention due to rapid increment in the price of fossil fuels. It has an open new window to replace natural gas. There are several up-gradation technologies are available and developed by many scientists. In this paper, attempts have been made to discuss various biogas purification technologies, which are widely used all over the world and major technologies, which are under development or research. The widely accepted technologies have been with more prominence on their operation, merits and demerits and their future scope are also discussed.