The training programs that polytechnic students undertake focus on practical and real-world application skills for their future careers. In the process, students need career counseling that strengthens their career decision-making. Web-based career counseling has a great deal of potential for increasing students' career decision-making capabilities in a significant way. This study's purpose is to investigate the efficacy of web-based career counseling in enhancing prospective polytechnic students' career decision-making. The research used an experimental research design. A simple randomization strategy was used to assign the 37 polytechnic students from a Nigerian polytechnic to either the web-based career counseling group (n=18) or to the control group (n=19). The data was gathered using a career decision-making scale. The duration of the web-based career counseling intervention was 6 weeks; each online session took place two times per week and a two-week follow-up was done after three months. The duration for each web-based career counseling session was 75 minutes. It was found that web-based career counseling intervention significantly enhances students' career decision-making, and as a result, career practitioners and counselors can benefit from similar research endeavor as they continue to support students in their career development journey.