The final straw was her defense in October of Halloween costumes that include blackface.
Her announcement came after NBC terminated her three-year, $69 million contract - but vowed to pay the full value left on her paycheck.
Kelly's exit from NBC was greeted on social media with a mix of celebration and critical barbs directed at the network.
NBC hired Kelly in January 2017, beating out several networks that had expressed interest in the FOX News star.
NBC announced on October 26 that Kelly's troubled hour of the NBC News flagship "Today" would not return after the controversial "blackface" remarks.
Former news host Megyn Kelly has officially severed ties with NBC and salvaged the remaining payments from her astonishing $69 million contract deal, the network reported Friday night.
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While she won't be allowed to sling mud at NBC, reports also claim that Kelly is not believed to be subject to any agreement that would prevent her from seeking work at another network.
The 9 a.m. hour, hosted by Kelly, shot up 10 percent in viewers the month after her exit, according to Nielsen numbers. "I want to look at everything", she said.
News announced its professional divorce agreement with Megyn Kelly late on Friday (Saturday NZT), ending its association with the former Fox News Channel star. Their ratings were an 18 percent increase from her average audience of 29 million. But NBC canceled her show. "You do get in trouble if you are a white person who puts on blackface for Halloween or a black person who puts on whiteface for Halloween. Back when I was a kid that was ok, as long as you were dressing up as, like, a character".
Critics accused her of ignoring the ugly history of minstrel shows and movies in which whites applied blackface to mock blacks.
Kelly's tenure at NBC News was rocky from the start, beginning with a short-lived Sunday night newsmagazine program that was rolled out with a widely panned interview with Russian President Vladimir Putin.