This study reports the results of a mixed-methods approach to investigate the impact of peer online learner-driven feedback (LDF) using Google Docs and peer-editing in a face-to-face classroom on EFL learners' writing skill. As this study was conducted using a quasi-experimental design, two intact groups, each including twenty EFL learners, were selected as the participants of the study. They were attending an IELTS preparation course at a language school in Iran. To assess the learners' IELTS academic writing skills, we used academic writing task 1 and task 2 and conducted semi-structured interviews to explore the learners' perceptions towards the impact of online learner-driven peer-editing on writing tasks. An independent-samples t-test, along with two one-way MANCOVA, was used to analyse the quantitative data. The results showed that LDF-based peer-editing significantly enhanced the learners' academic writing skills, compared to the conventional in-class feedback. The thematic analysis used to analyse the qualitative data shed light on the learners' positive perceptions towards the effect of online learner-driven peer-editing on academic writing skills.