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Players who originally began playing Grand Theft Auto Online when it was released on Xbox 360 / Playstation 3 are able to transfer their characters to their GTA Online account on Playstation 4 / Xbox One. Players who wish to import a character to GTA Online on PC can also do so, provided they have not previously transferred said character from one platform to another.
Transferring characters from a previous-generation game to is a simple process.