Abstract. Biometric identification technologies are becoming increasingly important in modern information security systems. Among various biometric methods, fingerprint recognition systems are widely used due to their high reliability, uniqueness, and stability throughout a person’s lifetime. This paper analyzes digital image processing algorithms used in fingerprint-based biometric identification systems. The study examines the main stages of fingerprint image processing, including preprocessing, segmentation, binarization, ridge thinning, minutiae extraction, and matching algorithms.