Judges first refused to confirm the charges of murder, rape, persecution and inhuman acts in June and said more evidence was needed before they could send Gbagbo to trial.
The appeals decision was announced today.
Gbagbo is the first former head of state to appear at ICC. Prosecutors alleged that he is responsible for crimes committed by his supporters against backers of his political rival, and now president, Alassane Ouattara in the aftermath of 2010 elections.