Hydrogen storage is captivating to research interest as it has renewable, green, and clean energy properties. Therefore, continual research has been conducted to find suitable and innovative compounds that can fulfill the criteria of H2 storage. First-principles study of XPdH3 (X=Li, Na, K) compounds are conducted to examine their properties by using the full potential-linearized augmented-plane-wave (FP-LAPW) method installed in the WIEN2K code. Numerous properties of these hydrides such as electronic, structural, thermoelectric, and elastic have been studied. XPdH3 (X = Li, Na, K) compounds have Pm3m (221) space group and cubic crystal structures. The electronic properties of XPdH3 (X = Li, Na, K) compounds are metallic. All three hydrides are stable and satisfied Born stability criteria. The gravimetric H2 storage capacities of these compounds are 2.598, 2.2381, and 2.0355 wt % respectively. Moreover, the thermal properties of XPdH3 (X=Li, Na, K) are also discussed using Boltztrap software.