<p>This study explores the influence of the Co²⁺/Ni²⁺ ratio in the bath on the structural, morphological, and magnetic properties of CoNi thin films electrodeposited onto FTO substrates. The investigation reveals a dependence of film characteristics on Co content. Anomalous codeposition of Cobalt (Co) and Nickel (Ni) is observed, leading to increased Co content and thicker films with rising Co²⁺/Ni²⁺ ratios. X-ray diffraction analysis (XRD) detects FCC and HCP phases depending on the Co percentage. Scanning electron microscopy (SEM) unveils variations in film morphology, while atomic force microscopy (AFM) confirms the granular nature of the films. Magnetic characterization demonstrates soft ferromagnetic behavior with tunable coercive field and saturation magnetization influenced by Co content. The highest squareness ratio (<i>S</i> = 0.83) is achieved for the Co-rich film (Co₉₃Ni₇), followed by <i>S</i> = 0.70 for Co₅₉Ni₄₁ and <i>S</i> = 0.68 for Co₃₀Ni₇₀, indicating improved magnetic anisotropy and single-domain configuration with increasing cobalt concentration. These high squareness values suggest optimal magnetic stability, particularly in Co-rich films. Density Functional theory (DFT) calculations of magnetization show strong coherence with experimental results, further validating the observed trends. These enhancements in magnetic properties suggest promising applications in magnetic recording media, where high squareness and tunable coercivity are critical for optimizing data storage density and reliability. These findings elucidate the interplay between Co content and thin film properties, paving the way for tailored CoNi thin films for applications like magnetic recording.</p>