The burly German cantered to a fourth stage win of the Tour at the end of Tuesday's 178km 10th stage from Perigueux to Bergerac, as Chris Froome retained his overall lead.
Kittel's compatriot John Degenkolb took second, ahead of Dutchman Dylan Groenewegen in third, and then admitted that it wasn't possible to beat his countryman.
"When I was going in the last kilometre, I thought the sprint was already over, but then a miracle happened and Marcel overtook me!" Degenkolb said ironically.
"I did a full sprint to stay on his slipstream and that took me to second place. Today he was unbeatable, that's for sure."
The 29-year-old Kittel was imperious, winning easily as he accelerated from six bodies back to streak several bike lengths clear.
"It's true, it's amazing, I can't even tell you how proud I am," said the Quick-Step sprinter.
"It's a fourth stage win in 10 days, that's a great achievement for me and the team."
It was the manner of Kittel's victory that was most impressive as he even had time to raise his arms in celebration before crossing the line.
'I'm the strongest'
It means he is well set to make this his best Tour yet as he has already matched his previous top effort – four stage wins in both 2013 and 2014 – less than half the way through this year's race.
"I think I can say I'm the strongest Marcel at the moment, I've never felt better," he said.
"I'm in a very good condition, that's something for me that's also a big achievement. That gives me also confidence."
Kittel has won four of the five flat sprint finishes at the Tour this year, and in the only one he didn't claim, he was held up by a crash in the final kilometre.
"It's true, it's amazing, I can't even tell you how proud I am," said the Quick-Step sprinter.
"It's a fourth stage win in 10 days, that's a great achievement for me and the team."
It was the manner of Kittel's victory that was most impressive as he even had time to raise his arms in celebration before crossing the line.
'I'm the strongest'
It means he is well set to make this his best Tour yet as he has already matched his previous top effort – four stage wins in both 2013 and 2014 – less than half the way through this year's race.
"I think I can say I'm the strongest Marcel at the moment, I've never felt better," he said.
"I'm in a very good condition, that's something for me that's also a big achievement. That gives me also confidence."
Kittel has won four of the five flat sprint finishes at the Tour this year, and in the only one he didn't claim, he was held up by a crash in the final kilometre.
