This study presents the design and implementation of a modular, interactive tool for visualizing and understanding the Elliptic Curve Digital Signature Algorithm (ECDSA). Developed in Python with a Streamlit interface, the tool enables users to explore each phase of the signature process—key generation, message signing, and signature verification—by exposing intermediate values typically hidden in conventional cryptographic libraries. Its pedagogical aim is to bridge the gap between abstract mathematical foundations and practical cryptography, making ECDSA accessible to students and early-stage researchers. The tool includes interactive features such as contextual explanations, dynamic feedback, and simulations of cryptographic pitfalls (e.g., nonce reuse), all designed to enhance learning. Its modular architecture supports classroom use and future extensibility to other cryptographic schemes. The tool has been positively received in undergraduate and postgraduate cryptography courses for improving students’ conceptual understanding of ECDSA. Future iterations will expand support for multiple elliptic curves, simulate advanced attack scenarios, and integrate with blockchain platforms to provide a broader cryptographic context.