California permits handwritten wills, also called holographic wills. You do not even need a witness to sign your holographic will. However, it's not the best idea to handwrite your will. It's best to create a formal, printed will signed by two witnesses. It is challenging to prove the validity of a handwritten will after someone has passed. Additionally, none of your potential heirs can claim you were not of sound mind or under someone else's influence when you create a formal will.