The Orica-Scott rider launched an attack with 4.6km to go and soloed the rest of the way up the mountain.
The 2017 Tour de France has seen eight first-time stage winners and the emergence of a few smaller teams, a treat for cycling fans.
Fabio Aru and his Astana team recognize that the Tour's yellow jersey may be out of reach but promise a fight on the Izoard in stage 18.
Rigoberto Urán's tactical wisdom helps the Colombian slip onto the Tour podium in the race's penultimate mountain stage.
Team Sky imposed its will on the peloton in stage 17, escorting Chris Froome over the Telegraph and Galibier to protect the yellow jersey.
With the Tour de France concluding in a few days, news about potential rider transfers is heating up.
Kittel was leading the points competition and had won five stages before he exited.
With three riders within 29 seconds of Chris Froome, the Sky riders hope to keep their leader in yellow as the race hits the Alps.
Insiders suggest that Alberto Contador may end his Tour de France career this week with a potential Giro/Vuelta plan for 2018.
BrakeThrough Media has an unusual opportunity to photograph the Tour de France on the lonely Mur de Péguère.