Casters are attachments that fit into or over legs of a bed frame. The caster looks like a small metal rod several inches long that ends in a wheel. Basic casters have a wheel only, while more advanced casters have wheels that you can lock in place. The wheel itself also comes in different sizes, from a few centimetres to several inches wide. Casters allow you to move your bed frame around the room without scratching the floor or having to remove the mattress. You may wish to remove them to lower the bed or create more stability.
Remove the mattress and box spring from the bed frame and put them aside.
Flip over the bed frame or prop up a corner high enough to give you access to the caster. Determine if the caster is inserted into the bed frame on its own or a pin or button holds it in place.
Grasp the caster firmly in your hand and pull straight from the bed frame if it has no pin or button holding it in. Twist the caster gently to loosen it if it will not move.
Pull out the pin or depress the button if either of these features secure the caster to the frame. Pull the caster straight from the frame to remove.
Spray a lubricant, such as WD-40, around the seal of the caster to help loosen it if the caster is stuck. Allow the lubricant to soak in for several minutes and remove the caster as described above.
Consider replacing the removed casters with gliders, which look like casters but have flat feet instead of a wheel. These can help protect your floor and keep your bed stable.