The technology that significantly supports the load-balancing and fault-tolerance capabilities in Grids is the job’s checkpointing mechanism. Nevertheless, contemporary Grid environments distinctly lack the possibility of integration with the low-level processes’ checkpointers. Nowadays, some Grids support the checkpointing of applications which internally implement this functionality and additionally adhere to the imposed interface. On the contrary, the paper describes the Grid Checkpointing Service, the prototype design and implementation of Grid-level service, which makes it possible to utilize low-level or legacy checkpointing packages in Grids. In fact, the presented service is a proof-of-concept implementation of a part of the Grid Checkpointing Architecture (GCA). Nevertheless, the way the GCS was implemented allows it to be installed and utilized independently of the other parts of the GCA.