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In this work, TiO₂ thin films were prepared using sol-gel spin-coating method deposited on glass substrate and annealed at various temperatures (450, 500 and 550 °C) for 2 h. According to XRD and Raman analysis, TiO₂ films show only anatase phases. The crystallites sizes were increased with annealing temperature whereas the optical transmittance was higher than 80 % in the visible region. The reflective index, thickness and the gap energy values were deduced from transmittance data. The gap energy was decrease with the increase of annealing temperature. The photocatalytic activity of TiO₂ was tested and shows the degradation of methylene blue (MB) under UV light irradiation.