"I like being here and I'd like to get locked in, but things didn't pan out," Webb said Friday night, confirming an MLB.com report from earlier in the day.
Both D-backs GM Josh Byrnes and Webb's agent, Jonathan Maurer, declined to comment on the negotiations.
The two sides left open the possibility that discussions could resume at some point, but Webb will be in a D-backs uniform for the near future even without further progress. The right-hander is under contract through the 2009 season, and the D-backs hold an $8.5 million option for 2010.
"I've still got 2 1/2 years here, so there's definitely still time," said Webb. "If it comes down to that, we'll address it."
The two sides began discussing the possibility of an extension during Spring Training, and a source said the talks focused on an extension of three years.
On Friday, Webb sounded relieved that at least there had been some resolution for now.
"I'm done talking about it," Webb said. "It's gone on for five months, so I'm tired of it. It's been off and on, but just to have something keep going on and on and on for months, it does kind of wear on you a little bit, and to have it done and over with for right now, it's good to get that off my mind."
While not revealing the specifics of the potential deal, Webb said he thought the two sides were close at one point and admitted that the talks were somewhat distracting.
"Kind of trying to do stuff on the mound and not knowing if that's going to help you or hurt you in the meantime," Webb said. "There's a lot of things that go into it."
Webb, who is 11-3 with a 3.27 ERA this year, was the National League Cy Young Award winner in 2006 and finished second to San Diego's Jake Peavy in the balloting last season.
Steve Gilbert is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.