A cover is disclose for a hook on high chair and portable seat, the cover protects the hook-on high chair from messes that would require the chair to be cleaned and/or disassembled. The cover is fitted with elastic that hug around the top of the highchair that helps keep the cover in place. There are 2 straps to both sides of the highchair which go under the arms of the highchair and attaches to the fabric that drapes over the front of the highchair. The front of the highchair has a flap over the buckle to maintain functionality of the cover while providing quick access to the buckle. The flap is secured by hook and loop fasteners, buttons, snaps and other mechanisms. The front of the cover has two openings that allow legs through the cover and highchair.