"I am delighted to be here at Arsenal and to be part of one of the great teams in English football," said Giroud, who passed a medical on Monday evening. "It's a huge satisfaction to join this great club and it's been a dream since I was young to play in the Premier League.
"I was attracted by the philosophy of football and Arsène Wenger's 'touch' at this club. I have always admired Arsenal with its great history and reputation, and I now hope to achieve great things here. I'm very proud to be a Gunner and I will give my best for all the Arsenal fans."