The 23-year-old singer also revealed the release date of the single in the same post.
"SIGN OF THE TIMES // 7 APRIL 17 //," the caption read.
The post was accompanied by what appears to be artwork for the single.
Styles was long expected to be the first One Directioner to break off into his own project, before Zayn Malik unexpectedly quit in 2015 to embark on his own solo career.
Meanwhile, soon after the single is released, Styles will be taking his new music to the stage.
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