The FLATSIM service (ForM@Ter LArge-scale multi-Temporal Sentinel-1 InterferoMetry) is developed as part of the ForM@Ter Solid Earth data and services center of the Data Terra French Research Infrastructure, and is operated by CNES. It allows systematic processing of interferograms from Sentinel-1 data, as well as displacement time series, over large geographic areas. It is based on the InSAR “New Small temporal and spatial BASelines” (NSBAS) processing chain. FLATSIM data can be accessed through https://flatsim.cnes.fr/doi/. The data are under license CC BY-NC 4.0.