The present invention provides a compact device (that may be installed onto a mobile or stationary platform) for conversion of waste to sources of energy or fertilizer. The device includes multiple stages for efficient conversation and processing of waste into energy or fertilizer, including a first stage for reducing a size of received waste, a second stage for compressing the reduced sized waste into partially dehydrated waste, a third stage for grinding and further compression of received waste from second stage to pulverize the constituent parts into highly dense substantially dehydrated pellets or fertilizers, with a fourth stage for further drying of the received pellets or fertilizers and a final fifth stage for cooling the received pellets or fertilizers into highly dense pellets. The device of the present invention further includes a controller for controlling each operational stage.