The step according to police officials has been taken to thwart possible attempts by militant or terror groups to disrupt official celebrations.
"In view of the Republic Day function adequate security arrangements are in place in the city and elsewhere to ensure celebrations are conducted without any disruption," a senior police official posted in New Delhi said.
The police officials have intensified checking and patrolling at metro stations, railway stations, airport and bus terminals as part of the security arrangement.
"Ahead of Republic Day, intensive foot patrolling at malls, strong vigil from morchas in markets and border picket checking were carried out. Private security guards deployed at malls were also briefed to be a part of the security apparatus," a statement issued by deputy commissioner of police South West Delhi said.
Reports said additional 48 Companies of Central Armed Police Forces (CAPFs) have been deployed to supplement the internal mobilization by Delhi Police of around 22,000 police personnel, in uniform and plainclothes.
Apart from security deployment, authorities have installed CCTV cameras at strategic locations in the national capital to keep a vigil on the movement of people.
Police said multi-layered security arrangements were in place in the city and routes around the venue have been closed.
"Sharpshooters and snipers will be deployed atop high-rise buildings to keep a watch on the 8km-long parade route from Rajpath to the Red Fort on Sunday (January 26)," an official said.
The Delhi traffic police have issued an advisory for general public to avoid routes around Red Fort.
Likewise, the Delhi Metro Rail Corporation has closed parking facilities at all its stations from Saturday morning until Sunday 2:00 p.m. (local time).
On Thursday amid tight security, a full dress rehearsal for Republic Day parade was held in New Delhi.
Unprecedented security arrangements have been made in northeastern states of India and restive Indian-controlled Kashmir for the upcoming celebrations.
President of Brazil Jair Messias Bolsonaro will be the chief guest at Republic Day celebrations scheduled on Sunday in New Delhi.
The Republic Day in India marks adoption of the constitution of India. Every year the day is celebrated by India on Jan. 26. The main function is held in New Delhi, where India's armed forces - army, navy and air force display their skills and military might.