A French tourist was randomly slashed in the neck while strolling in Harlem with his girlfriend on Friday, police said.

Video obtained by The Post showed the 27-year-old man kneeling on a sidewalk, with his blood spilling on the pavement, as people press a cloth to his neck and his distraught girlfriend holds him while talking to police.

The unidentified couple was walking on Adam Clayton Powell Jr. Boulevard between West 132nd and 133rd streets at around 11 a.m. when a stranger slashed the man across the face and neck with a knife, cops said.

“One of my customers ran in asking me if I could speak French. He said someone got cut on the neck but [that the victim] wasn’t speaking English,” said Oliver Dominguez, a worker at the nearby Maya Hardware Store.

The tourist and his girlfriend had just walked out of the IHOP on Adam Clayton Powell Jr. Boulevard at West 135th Street when the unprovoked attack happened, police sources said.

EMS rushed the man to Harlem Hospital, where he was listed in critical but stable condition.

Police canvassed the neighborhood for a suspect dressed in black and wearing Air Jordan sneakers but had yet to find him as of Friday evening.

A man who works in a nearby building recounted the attack after seeing it on surveillance tape.

“A man and woman were walking down the street, and a guy was walking beside them, like side-by-side. Then [the attacker] turns towards [the victim], looked him in the eye and pulled out — it looked like a boxcutter — and sliced him on the neck,” the worker said.

“He didn’t know him,” he said of the victim. “He even looked at the guy before he cut him and made a surprised face.”

A cyclist stopped at the scene to help stanch the bleeding, while another passerby held the injured man’s hand.

Others in the neighborhood were upset by the attack.

“I’m so surprised. I just want them to catch this guy. It’s so random, and it could have been me,” said a worker at the Adam Clayton Powell Jr. Homeless Shelter.

William Modeste, 38, a local real estate agent with Uptown Flats, said: “I think it’s a random attack and so unexpected.

“We always have plenty of visitors in the neighborhood, and when I heard about it, I just thought, ‘This person had cruelty on his mind.’”