por voluntad propia

of one's own free will

→ por
phrase Rare #48,144
of one's own free will Indicates that someone acts voluntarily, without being forced or coerced. The possessive adjective changes to match the person: por voluntad propia, por voluntad propia, por voluntad propia.
SP: Aceptó el trabajo por voluntad propia.
EN: She accepted the job of her own free will.

Lo hizo por voluntad propia.

He did it of his own free will.

Ella no se casó con él por voluntad propia.

She didn’t marry him of her own free will.

Me he entregado por voluntad propia.

I turned myself in of my own accord.

— Chicago (2002)

Y que vienes aquí por voluntad propia?

And you come here of your own free will?