The synthesis of shape-controlled nanoparticles has attracted wide attention in recent years due to their tunable properties along with various morphologies. Cs_xWO₃ is a great candidate for application in solar filters based on its high transmittance in the visible region and excellent shielding performance in the near-infrared (NIR) region. However, the relationship between NIR absorption performance and different shaped Cs_xWO₃ particles has been rarely reported. In this paper, two-dimensional (2D) Cs_0.3WO₃ nanosheets, one-dimensional (1D) Cs_0.3WO₃ nanofibers and zero-dimensional (0D) Cs_0.3WO₃ nanoparticles were successfully synthesized via a simple hydrothermal approach, and the related photoresponse properties were also investigated. The results show that the 2D nanosheets present much stronger absorption in the wavelength range of 300–20 000 nm as compared to the 1D nanofibers and 0D nanoparticles. Under 10 s of continual irradiation by a 50 W halogen lamp, the peak temperature of the 1D nanofibers and 0D nanoparticles increased from 20 °C to 73.2 °C and 63.8 °C, which are only 53.2 °C and 43.8 °C temperature gains, respectively. For the 2D nanosheets the peak temperature reached to 88.5 °C, which is about 68.5 °C temperature gain, almost 56% and 29% higher than that of the 0D nanoparticles and 1D nanofibers, respectively. The highest adiabatic temperature difference between the blank quartz glass and 2D Cs_0.3WO₃ nanosheets coated on the quartz glass was 9.2 °C. The photothermal conversion efficiency of the 2D, 1D and 0D samples was about 43.2%, 27.6% and 24.4%, respectively. These results indicate that the 2D Cs_0.3WO₃ sample is an effective NIR absorption and photothermal conversion material that can be used for NIR shielding, and also has great potential in biomedical applications.