"Top notch education really tipped the boat for me," Fuller told ESPN.com's Dave Hooker in a text message. "They have a 98 percent graduation rate for players."
Fuller also said the NCAA's sanctions on the Nittany Lions didn't play a role in his decision, but, he added, Notre Dame offered him in response to the issues at Penn State.
"I just know I have a better opportunity at Notre Dame," he said.
The switch came on the heels of last week's visit to Penn State, in which Fuller reaffirmed his commitment there. He tweeted July 28 that he was "100% committed to the greatest college."
The 6-foot-1, 163-pound Fuller was the lone Penn State commit who was recruited as a wideout. Zach Bradshaw was expected to play linebacker.
The commitment boosts Notre Dame's No. 8-rated class to 19 pledges. Penn State now has 11 verbals.