Yes, a DIY will is still a valid will, as long as it meets the legal requirements in your state. For example, if you write your will by hand (known as a “holographic” will), you should still have two witnesses—who saw you sign the will and don’t stand to inherit anything from you—sign it. It is still possible the court will honor your will without the signatures, but it’s better to be safe and meet the legal requirements for a valid will.