What are you allowed to change on the official registration plate?

According to German traffic regulations, the official registration plate must remain unchanged to ensure its authenticity and readability. You are not allowed to modify, cover, or add anything that alters its appearance, including protective foils or stickers. Even transparent protective foils can affect the visibility or reflectivity of the plate, which is why they are not permitted. Keeping the plate exactly as issued helps authorities easily identify vehicles and prevents misuse or tampering.