Maybe someone knows law can answer this. Is it a crime to ”unredact” files in the US? You probably know that the information is classified since you are putting in the work. Where I live I believe it’s a crime if you share information that is classified even if it’s leaked. So I would not publicly brag about this online.

In the US this is protected by the first amendment. Exceptions apply only for military and government employees who agree to prosecution in such cases as a condition for employment or enlistment (getting a clearance, basically). For everyone else it is lawful.