In present study, undoped ZnO, Zn_0.8Ag_0.2O, Zn_0.8Al_0.2O and Zn_0.6Al_0.2Ag_0.2O samples are synthesized by simple solution method. X-ray diffraction (XRD), Scanning Electron Microscopy (SEM), Energy-Dispersive X-ray spectroscopy (EDX) and UV-visible (UV-Vis) spectroscopy are used to perform the characterization of undoped, doped and codoped samples. XRD analysis is exposed that hexagonal wurtzite crystalline structure obtained for undoped, doped and codoped samples without any extra representation of impurity phases. The crystalline size is when evaluated by using Scherrer, It has 44, 49, 41and 37nm for undoped ZnO, Zn_0.8Ag_0.2O, Zn_0.8Al_0.2O and Zn_0.6Al_0.2Ag_0.2O samples. Similarly, the crystalline size and strain are also evaluated by Williamson hall (W-H) and size strain plot (SSP) for the undoped, doped and codoped nanoparticles. The evaluated crystalline size by SSP is three times greater than the result of the scherrer method. The SEM exposes that surface morphology of nanoparticle samples, in this case is the formation of large agglomeration in spherical shape with nanocrystallites of undoped and doped ZnO with apparent and definite boundaries. EDX points out the replacement of Al²⁺ and Ag⁺ with Zn²⁺ in ZnO matrix and consequences in the development of single-phase Zn_1−x−yAg_xAl_yO. The blueshift is shown in UV-Vis absorption spectra because the band gap value increases with the increase in doping, except Ag⁺ doped ZnO nanoparticles.