A file folder edge reinforcement for the free edge of a file and having, and elongated reinforcement panel of flexible polyester film to overly the front and back sides of a free edge of the file, notches formed in the ends of the panel, an adhesive layer on the undersurface of the panel, an adhesive barrier backing panel releasably secured to the undersurface of the reinforcement panel, a fold line defined by an axis between the notches, along which the panel can be folded to overly both the front and back of the free edge of the file.