Winston, 29, started all 16 games at right tackle this past season, his lone campaign in Kansas City after spending his first six years with Houston.
He was expected to earn a base salary of just under $5 million in 2013.
"Just wanted to confirm that I have been released," Winston wrote on Twitter. "Even though it was an incredibly tough year on and off the field last year, I wouldn't trade the relationships I made in KC and the overall experience I had for anything. It was an honor to be a Chief ..."