The method and the device are used to produce filled containers. A preform (2) made of a thermoplastic material is first subjected to thermal conditioning in the area of a heating section along a transport path. Then the preform (2) is shaped into the container (11) inside a mold by applying pressure. A filling medium (21) with which the container is to be filled is used as the fluid for forming the container. The preform (2) is guided at least intermittently while the preform is shaped into the container (11).