Abstract: A toilet seat adapter device that is configured to be positioned on a rear section of a standard toilet seat in order to reduce the size of the seat opening. The adapter has a main body that is configured to be seated within the toilet seat opening. A first pair of movable arms extend form the right side of the main body and a second pair of movable arms extend form the left side of the main body. Each pair of movable arms terminate in clamp or similar gripping interface to capture a toilet seat and maintain the main body securely positioned on the toilet. The pairs of movable arms may be secured at any of various points to allow a user to apply the adapter to any of various sized toilet seats. One more LEDs may be encapsulated in or embedded on the toilet seat adapter.