This editor can be used to edit Borderlands 2 save files that exist in your PC, Xbox 360 and PS4. This means that you can adjust or improve various aspects of your character such as character level, experience points, head, skin, credits, weapon, etc. Apart from WillowTree, Gibbed is one of the most reliable Borderlands 2 save editor.
Gibbed save editor is basically a software that lets you modify Borderlands 2 save files.