Nowadays, there is an increasing recognition of the value of eco-innovation in both academic and practical spheres. Establishing the connection between eco-innovation and corporate performance is highly important. This paper aimed to analyze the correlation between eco-innovation, corporate performance, and company size. To accomplish this goal, the paper collected unique data from 383 global non-financial companies using the Refinitiv Eikon database from 2013 to 2022. This paper uses fixed effect and (generalized method of moment) GMM techniques to overcome possible endogeneity concerns. The strong empirical results display a positive relationship between eco-innovation and corporate performance. Importantly, this paper discovered that the size of companies significantly magnifies the effect of eco-innovation on corporate performance. Our findings are still robust to endogeneity concerns. The results confirm that prioritizing eco-innovation can benefit larger companies in multiple ways, including boosting productivity, avoiding penalties, expanding into new markets, improving green image, and gaining a competitive edge, all of which ultimately enhance corporate performance. Additionally, the extensive evaluation by stakeholders enables these larger corporations to generate increased profits. This paper aims to contribute the innovation literature by exploring an under-explored topic using extensive panel data and offering practical guidance for non-financial firm stakeholders. The implications of the findings have various impacts on future research and policy development. Furthermore, this paper aims to assist policymakers in establishing impactful mechanisms and guidelines that foster ecologically conscious attitudes. The conclusion assists managers in grasping the importance of context-based eco-innovation.