"Leave the worrying to the NYPD," said James O'Neill, chief of the department. "People should feel safest this New Year's Eve because we're there."
Police Commissioner William Bratton said there were no credible threats to the city ahead of the holiday. Yet officials also acknowledged that there were limits to what they could do to ensure security, especially outside the tightly controlled blocks at the heart of the celebration. In much of the city, the focus will be on fast responses to any emergency rather than preventive measures like security checkpoints.
"The ability to protect everything all the time everywhere is not possible in any venue anywhere in the world," Bratton said.
Outside that zone, revelers and vehicles can come and go as they please.
At least 6,000 patrol officers will be assigned to the festivities. Visitors will see heavily armed counter-terrorism teams and bomb-sniffing dogs.
The bomb squad and a unit specialising in chemical and biological threats will sweep hotels, theaters, construction sites and parking garages. They also will patrol the Times Square subway station, and certain exits will be blocked off. The NYPD will rely on a network of thousands of closed-circuit security cameras blanketing lower Manhattan, parts of midtown Manhattan and the subway system. About 20,000 smartphones were handed out to officers this year that will allow police to quickly transmit information on potential threats.
And this year, a specialised counter-terrorism unit of 500 highly trained officers will be deployed to respond to any emergency.
The unit was first formed after attacks in January at the French satirical weekly Charlie Hebdo. Bratton said the department is constantly evolving based on new information as well as the recent attacks in Paris and San Bernardino, California.
Carrie Underwood, Luke Bryan, Wiz Khalifa, Charlie Puth and Demi Lovato are among the musical guests schedule to perform this year. When the clock strikes midnight and the ball drops, so will 1 tonne of confetti - scraps of paper with well wishes for the upcoming year.
After the show, sanitation crews will get to work cleaning up from the celebration, working through the night to dispose of an estimated 50 tonnes of garbage, including confetti, party hats and other leftovers from the revelry.

