Résumé : Com­puter-me­di­ated in­ter­group con­tact (CMIC) is a valu­able strat­egy to re­duce neg­a­tive sen­ti­ments to­wards mem­bers of dif­fer­ent so­cial groups. We ex­am­ined whether char­ac­ter­is­tics of com­mu­ni­ca­tion me­dia that fa­cil­i­tate in­ter­group en­coun­ters shape its ef­fect on out-group at­ti­tudes. Specif­i­cally, we pro­pose that con­ceal­ing in­di­vid­u­at­ing cues about out-group mem­bers dur­ing CMIC in­creases prej­u­dice, as in­ter­ac­tion part­ners are per­ceived as less so­cially pre­sent. To as­sess these hy­pothe­ses, we con­ducted two mixed-fac­to­r­ial ex­per­i­ments. Par­tic­i­pants en­gaged in syn­chro­nous text-chat with out-group mem­bers (Study 1) and a con­fed­er­ate (Study 2) who ei­ther shared or con­cealed their name and photo. Over­all, CMIC re­duced neg­a­tive out-group sen­ti­ments. Study 2 showed, how­ever, that out-group mem­bers' anonymity de­creased per­ceived so­cial pres­ence, which was as­so­ci­ated with less pos­i­tive eval­u­a­tions of the CMIC and higher prej­u­dice. In con­clu­sion, CMIC can con­tribute to con­flict res­o­lu­tion in­ter­ven­tions, prepar­ing in­di­vid­u­als for di­rect in­ter­group con­tact, if its af­for­dances or con­ver­sa­tion top­ics en­hance in­ter­ac­tion part­ners' so­cial pres­ence.