Gordon Brown has pledged to secure the economic recovery and make government more accountable, as he unveiled his five election pledges.
He hailed Labour as the "people's party" in a speech to activists.
He pledged to raise living standards, protect frontline services, strengthen fairness and build a hi-tech economy.
Tory leader David Cameron said Mr Brown should not "dither" and must call an election, while Lib Dem leader Nick Clegg called the pledges "vacuous".
In a rallying speech to Labour Party members in Nottingham, Mr Brown said: "We are fighting for Britain's future - and we intend to win."
He said he knew people were sceptical about politicians' pledges but said these were "not general pledges without details, without tests, without scrutiny".
