To blackout windows, use blackout curtains or shades that block out light completely. Install the curtains or shades tightly against the window frame to prevent any light gaps. Alternatively, apply blackout window film or adhesive blackout liners directly to the window glass. For a temporary solution, use foam board or cardboard cutouts to cover the windows. Ensure the blackout material is securely attached to provide effective light blockage.

Blackout windows using blackout curtains, shades, or films. Ensure a tight fit to prevent light gaps. Temporary solutions like foam board can also be used.