[5] The PDP is a striker-fired, recoil-operated semi-automatic pistol chambered in 9×19mm Parabellum,[6] with a longer grip and larger magazine capacity than the previous Walther design, the PPQ.

[7] The grip uses a custom texture, which makes acquisition of the red dot easier, and improves handling of the pistol in adverse weather conditions.

[3] American Rifleman called the PDP an "excellent addition to the market that will allow Walther to compete strongly against the established leaders", praising its "best-in-class trigger, excellent controls and exceptional accuracy."

[11] Guns & Ammo described it as "the most modular and versatile pistol designed by Walther", also noting its accuracy and high quality trigger.

[13] In 2022, Walther released a new competition-oriented variant of the PDP at that year's SHOT Show, the PDP SD Pro, which includes a threaded barrel, reinforced optic cut, flared magwell extension, and an improved trigger.