Introduction Polyesters are long chain polymers containing an ester linkage. They are used as films or fibre but also as composites, elastomers and for coating. The hyperbranched polyester has a core shell structure with tree like branches. The number of branches will determine the ratio of the molecular weight to size while the solubility and physical properties of the hyperbranched polyesters will be dictated mainly by the end groups exposed. In this application communication we analyze two hyperbranched polyesters samples by advanced size exclusion chromatography to assess the branching.