The present study examined the effect of the online reformulation and collaborative feedback on Iranian learners’ writing in an English as a foreign language (EFL) context. To this end, three female intact classes (N = 55) at the upper-intermediate level were selected. Two of these classes were thence randomly selected as the experimental groups (1 & 2) and the other one as the control group. Experimental group 1 was provided with online writing feedback in the form of reformulation. Experimental group 2 received online feedback through reformulation followed by general online sessions with the participants for extra individual guidance, i.e., online collaborative feedback in the form of post-writing conferences. The control group experienced the same amount of online writing instruction. They were, however, provided feedback conventionally without reformulation tasks and collaborative feedback. To measure writing proficiency, IELTS task 2 was administered as the pre-treatment and the post-treatment test. One-way ANOVA and Post-hoc Tukey Test were used to compare the mean score of the composition tests between groups. The significant effect of online reformulation and collaborative feedback on writing was confirmed. This study has pedagogical implications for EFL English teachers and stakeholders in providing feedback on EFL learners’ writings.