High school students often face difficulties in career planning due to limited understanding of their potential and available career options. This study aims to develop a website-based career card media and to examine its feasibility and effectiveness in improving students’ career planning. The research employed the Research and Development (R&D) method, adapted into seven stages. The sample consisted of 37 eleventh-grade students selected using purposive sampling. Data were collected through validation sheets and pre-test and post-test instruments, then analyzed using descriptive statistics, the Wilcoxon Signed Rank Test, and N-Gain Score. The results showed that the developed media was categorized as feasible by material experts (76%), very feasible by media experts (83.9%), and very feasible by practitioners (80.8%). Furthermore, there was a significant improvement in students’ career planning, indicated by an increase in the mean score from 77.32 to 82.11, a significance value of 0.000 < 0.05, and an N-Gain score of 78.37% (effective category). These findings indicate that the website-based career card media is feasible and effective to support career guidance services in schools.
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