An adjustable-foldable desk to be mounted on top of stationary desks, tables and counters with no attachments. Desk comprises leg(s) assemblies on left and right sides whereby connect desktop to the base of the desk. Spring-loaded buttons at upper portion of the leg(s) assemblies allow to release the engagement of the desktop in order to adjust the tilt of the desktop. Also, spring-loaded buttons at lower portions of the leg(s) assemblies allow to release the engagement of the leg with the base in order to swing the leg and substantially desktop in order to adjust the height of the desk.