The current iOS 11.1 delivers 5 watts of charging when placed a Qi-based charging pad. It will, it's said, upgrade the 2017 iPhone range's wireless charging power support to 7.5W. However, tech-savvy users who jailbreak their phones discover a completely new world and claim that as long as you stay away from shady sources, there's no need to worry about having your device compromised.
Using the Belkin charger that Apple sells, which does support 7.5W charging speeds, the iPhone X was charged from 46 to 66 percent over the course of thirty minutes. Samsung's $50 9-watt charging pad, as well as RavPower's $50 10-watt charging pad both support even faster charging speeds, and are compatible with the iPhone 8 and iPhone X due to the Qi wireless charging standard used in smartphones. The same phone took more than 30 minutes to get from 40 percent to 60 percent while charging wirelessly on a Qi pad.
If you're about to buy wireless chargers for the iPhone, make sure they support at least 7.5W speeds.