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We propose to use WFC3-UVIS to study the multiplicity of a sample of 60 young free-floating planets recently identified in the nearby Upper Scoand Taurus associations. The formation of these exotic objects is still largely an open question. Have they been ejected or stripped away from the planetary system in which they were bornquestionMark Or did they form isolated in a similar way to stars from the collapse and contraction of a tiny molecular clumpquestionMark WFC3-UVIS unique resolution and sensitivity will allow us to detect companions as close as virgul5au comma over a completely unexplored range of primary masses. The proposed comprehensive study of multiplicity among this unique sample of young (1 to 10Myr) Upper Sco and Taurus free floating planets will provide serious constraints for the theories of formation and allow to better understand the respective contributions of these different processes to the final free-floating planet population comma with important implications on brown dwarf and planet formation.