Writing is essential for learning English and enhancing vocabulary, grammar, and communication. Summarizing techniques are effective teaching strategies for improving students' writing skills. This study aimed to investigate the effect of summarizing techniques on students' writing ability and to explore students' perceptions of the summarizing technique that influences their writing ability. The study used a pre-experimental and involved 20 students from Unit 4 as participants at the Department of English Language Education who control and experiment groups. SPSS (Statistical Product and Service Solutions) for the data analysis after the test and questionnaire were used to gather the data. Then, questionnaires were obtained from students' perspectives to support the research findings. The scores of students in the summarizing technique increased significantly from the Pre-test to the Post-test, with an average difference of 5.0 mean. Then, the average difference in scores between the students' writing test pre-test and post-test was a mean of 4.05. The results showed that using the summarizing technique improved students' writing ability. Using summarization techniques is important, so it is essential to utilize them accordingly and recommended in the classroom to enhance writing abilities and benefit the learning process.