Abstract This study aimed to investigate the effectiveness of a program based on voice-text chat in enhancing EFL 1^st  year secondary students' writing skills and their self-efficacy. The participants of the study consisted of (48) first-year secondary students at Mohamed Ragab Azhari Institute, Gharbia Directorate. Instruments of the study were an EFL writing skills checklist, an EFL writing scoring rubric, an EFL pre and post writing test, an EFL writing self-efficacy scale, and a program based on voice-text chat. In this study, pre post-test was used with two groups (Experimental and control, 24 students each). Results of the research revealed that the research group posttest score in writing was significantly better than their pretests. Also, their self-efficacy toward writing improved considerably. The research group's gains in this productive skill and the enhancement in their attitude have been attributed to using the voice-text chat based program designed and implemented by the researcher.