We report a vibratory compaction process for a macronization (and densification) of carbon nanomaterials such as few- and multilayer graphene (FLG and MW) in order to decrease their dust forming and consequently their cyto- and ecotoxicity. Preliminary tests show that variable macro-shapes of FLG/MLG compacts (plates, spheres) are formed depending on the initial morphology of their (nano)microscopic counterparts. Such compactions of nanocarbons give more insight the potential use of graphenes for example in compaction technology of building materials (concrete). Since the vibratory compaction is performed in jtms sieves system, the separation of variable size graphenes is an additional advantage. (C) 2016 Elsevier B.V. All rights reserved.