The text of the bill was published on Saturday in the official journal, France's official gazette, turning it into law. It raises the retirement age from 62 to 64.
The country's retirement system is among the most generous in the industrialized world. The retirement age in most other European countries is 65.
The nine-member Constitutional Council on Friday upheld the text. It ruled that the government's raising of the retirement age complied with the constitution.
It shot down, however, further measures it did not consider essential to the reform, such as a proposal for a referendum on the age issue put forth by Macron's opponents on the political left.
Macron's controversial brainchild
Yet Macron, who also tried to pass the law during his first tenure, has said the plan is the only way to keep the country's pension fund from collapsing. He hopes to put it into action before the end of the year.
Opposition political parties have attempted to use the reform as yet another opportunity to frame the slick president as "out of touch" with the needs of French citizens.
Unions have called for nationwide protests on May 1, International Workers' Day.
rmt/sms (AFP, Reuters)