They look like this for example: BL2(BwAAAADSBhYoAgPQ0BBabQAiBeIGom3i/////////z8AInCibuI=) You use these when you want to add an item to your character. Gibbed codes are strings of text that refer to a specific item within Borderlands 2.
The Borderlands 2 Save File Editor by Gibbed lets you create new save.
There isn’t any way to transfer progress between PS4, XBox or PC, but you can move saves from the EGS version to the Steam version (and theoretically vice versa) on PC by manually moving save files.
Does Borderlands 2 have cross progression?