Abstrak
This research aims to investigate EFL students’ perceptions on using Grammarly in thesis writing. Several problems have been found in this research. Firstly, some EFL students thought that it was not important to use Grammarly in thesis writing. Secondly, some EFL students found that Grammarly is not reliable. Thirdly, some EFL students found that Grammarly gives inappropriate feedback. This was descriptive-qualitative research. The participants were 7 English education department students who had used Grammarly for their thesis writing. Interviews and documentation were used as the method of data collection. Results indicated that students are highly interested and enthusiastic about using Grammarly in their thesis writing. They consider Grammarly a valuable tool for checking grammar errors and validating the words in their writing.