Perovskites are highly versatile and promising materials for energy and sensing applications, and beyond. They are often referred to as “chameleon materials” as their properties can be tailored via compositional sub­stitution in the ABO₃ or ABX₃ structure [1]. Due to their potential in an extremely wide range of applications, from hydrogen or energy storage, in particular for lithium- and sodium-ion batteries, to catalysis, solar cells, sensors, thermochromic [2] and optoelectronic devices for displays, LEDs and radiation detection, perovskites are also synthesized in several forms, from single bulk crystals to polycrystalline films, dispersed and assembled nanocrystals, down to quantum dots, also with different structural dimensionality [3-7]. By scaling crystal size down to the nano-range, unique size-dependent properties and much larger surface-to-volume ratios arise, with consequently improved specific performances. Structure stability is a key point for perovskite design, also requiring careful optimization of microstructural and morphological parameters; low structural dimensionality e.g. can lead to improved stability as well, along with device flexibility. As a result, research on perovskite materials is a hot current topic and suitable characterization techniques and approaches are needed to assess structure-property relationships, particularly concerning nanostructures, taking into account the key constraint of rapid screening and short path from preparation to characterization laboratories before material degradation. Micro-diffraction, in particular for single crystal investigation, is typically available at synchrotron beamlines and is needful for structural studies whenever large crystals are not available; on the other hand, high intensity  X-rays with short-wavelength available at synchrotron beamlines can be necessary to study e.g. large perovskite crystals including heavy atoms, such as Pb, causing significant X-ray absorption. Advanced X-ray Scattering techniques in the small and wide angle ranges (SAXS and WAXS) are nowadays available in specialized laboratories thanks to high brilliance micro-sources and high-performance detectors (https://www.ic.cnr.it/laboratorio/xmi-lb/; https://www.itaca-sb.it/biosaxs/). Several experimental strategies are exploited, including Scanning Microscopy with scattering/absorption contrast, or Grazing Incidence geometry (GISAXS/GIWAXS), to address a large variety of studies requiring multiscale structural characterization. Representative case studies relevant to halide perovskite characterization will be shown, giving an insight into the effectiveness of state-of-the-art laboratory facilities combined with in-house developed software tools [8], as ready-to-use screening methods for self-consistent investigations as well as for preliminary tests to design further in-situ and operando experiments at large-scale facilities.