Yes, the iPhone charger can charge the ipad because they all use the same Lightning port. However, the output current of the phone charger is usually smaller and will charge more slowly than the standard charger for the iPad. Therefore, if you need to charge faster, it is recommended to use the iPad's standard charger or one with higher output power. At the same time, it is not recommended to use unofficial brands of chargers, which may have a negative impact on the battery health of the device.