At the start of free agency, the Browns placed the transition tag on Mack which would allow them to match any offer made to him.
The Browns did just that to secure him on a five-year deal after the Jaguars tried to lure him away from the AFC North side.
"I'm excited. I'm fired up," Mack told the Cleveland Plain Dealer. "There's no bad blood. Now that it's done, I'm happy."
Mack has played in every game for the Browns since he was selected in the first round of the 2009 Draft.