In recent years, technology-mediated collaborative writing has received great attention in the research literature. The purpose of the present study is to compare the effects of online collaborative writing using Google Docs and individual writing in a face-to-face conventional classroom on the writing performance of Iranian EFL learners. To this aim, a sample of 32 homogeneous intermediate learners was selected as the study's participants. They were then randomly divided into an experimental group (N = 16) and a control group (N = 16). Then, the experimental group participants performed online collaborative writing using Google Docs while the control group fulfilled individual papers in the face-to-face classroom. Two writing tasks by the students were employed to gather the data. Later, data were analyzed through paired-sample t-tests to investigate differences in writing in each group. Finally, ANCOVA was used to investigate the difference in writing performance between the two groups. This study added further insights concerning the contribution of Google Docs in technological research in technology-mediated collaborative writing and provided some pertinent pedagogical implications Manuscript profile