In the present study, a guar gum–based hydrogel was synthesized via graft polymerization of acrylic acid onto guar gum using glutaraldehyde as a cross-linking agent. Guar gum, a natural, biodegradable, and biocompatible polysaccharide, was selected as the backbone polymer to enhance the eco-friendly and biomedical potential of the hydrogel. The preparation method was optimized to obtain a stable, homogeneous, and mechanically robust gel network with improved swelling characteristics. The synthesized hydrogel was evaluated for its physicochemical properties, including swelling behaviour, gel fraction, and structural uniformity, to assess its suitability for biomedical applications. The influence of polymer composition and cross-linking density on hydrogel performance was also investigated. The results demonstrate that the guar gum–g–acrylic acid hydrogel exhibits desirable water uptake capacity and structural stability, highlighting its potential as a biodegradable and biocompatible material may use for controlled drug delivery and other pharmaceutical applications.