This study examines the effect of video recording in Google Drive as the self-assessing E-portfolio on high school EFL learners’ speaking fluency. To that end, a quasi-experimental comparison group research was implemented in which thirty Iranian high school EFL students were assigned either to e-portfolio or comparison groups. While the e-portfolio group assessed their own performance by keeping electronic portfolios in Google Drive, their counterparts in the comparison group presented their performance in the class. The students’ speaking fluency was assessed through both pre- and post-tests. A speaking rubric was used to get the students’ scores. The results of the independent sample t test showed that taking advantage of self-assessment through video-based e-portfolios improved the learners’ speaking fluency. The study had relevant implications for both material designers and language teachers not only to promote student speaking skills, but also to enhance students’ lifelong learning.