In academic writing, comprehensive feedback is one of the most influential parts of the course. Online learning situations inflict students to get comprehensive feedback regarding their grammar issues due to time constraints and the ineffectiveness lecturers' are facing.  Hence, many of the learners have to consider using an online-proofreader as a complement for solving this difficulty. Grammarly is considered to be one of the capable online-proofreaders used by Indonesian EFL learners due to its capability as a grammar proofreader regarding grammar structure, punctuation, and spelling. However, investigating the use of Grammarly is less investigated in Indonesian universities and terms of methodology. The previous studies are more focused on analyzing deeper and experiment whether or not Grammarly is effective. This study aims to explore EFL students' perceptions who use Grammarly as an online-proofreader for delivering feedback in Academic Writing. Since the researchers want to see students' perceptions about the use of Grammarly, a survey study will be employed in this research.  To conduct the study, the researcher will adopt Caveleri and Dianati’s (2016) research instrument.  The questionnaire was used by the previous study, so it does not need expert validation.