Financial terms were not immediately available.
"It's awesome," said Seubert, who will turn 29 on Sunday. "The Giants have been really good to me over the years and it is just good to know where I am going to be. I am going into my eighth season, so this is five more years. It is a dream come true to play out your career with one team and for it to be the New York Giants."
Seubert's career nearly ended in 2003 when his right leg was broken in three places in a game against the Philadelphia Eagles. He had surgery and missed all the 2004 season, and played in four games in 2005.
Seubert appeared in 14 games in 2006 with three starts. The former free agent returned as a full-time starter last year, helping the Giants average 134.3 yards rushing en route to their Super Bowl title.
"I played, I broke my leg, I missed a couple years, then I came back and I was a backup, and last year I finally got back on the field playing again," Seubert said. "You realize how much you do like the game and how much you want to be part of it."