A spokesman for Macron's movement said the alert was due to a "suspicious package."
The check was completed around 12:30 GMT (18:00 IST).
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Several hundred journalists who have been accredited for the post-election rally were asked to briefly move away from the site.
The Louvre, the most visited museum in the world, is situated on the banks of the River Seine in the heart of Paris.
The plaza is the square between the two long arms of the building, where its famous glass pyramid entrance is located.
The second-round vote in France's presidential election is taking place amid tight security, with tens of thousands of police and troops mounting guard.
A string of jihadist attacks since January 2015 have left at least 230 dead and hundreds injured.
On February 3, a 29-year-old Egyptian wielding knives attacked troops patrolling the underground access to Louvre. He was shot and wounded by the patrol.
On April 20, three days before the first round of the presidential poll, a policeman was shot dead on the Champs- Elysees avenue, in an attack claimed by the Islamic State (IS) group.
On Friday, a suspected extremist was detained near a military base outside Paris.
Sources close to the case told AFP that guns were discovered as well as a pledge of allegiance to IS and several of the group's flags.
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