While motivating learners for vocabulary learning is a problematic issue in the foreign language context, vocabulary learning via online learning tools has been taking an intriguing place in English language learning as a foreign language. However, how the use of online tools affects vocabulary learning motivation remains an unanswered question. This study aims to examine the effects of Quizlet, one of the online tools, on vocabulary learning motivation in the English as a foreign language (EFL) learning context. The sample group of the study consisted of 45 Turkish EFL learners at a state university. The study is designed to be one-group experimental research. After administering the vocabulary learning motivation scale as a pre-test, the participants were instructed regarding vocabulary items from their Psychology course on Quizlet for a 5-week-period. Then, the post-test was administered to the participants. The results indicated that the use of Quizlet does not have any influence on learners' inner motivation on vocabulary learning, while it creates an expectation for a short term reward from the teacher. It was also found that EFL learners have a high level of motivation to learn new vocabulary.