Abstract: The present invention pertains to a tool for the application of wallpaper border that simplifies the process of applying wallpaper border. The border application tool is especially useful in situations where the border is applied to a wall at its juncture with a ceiling. The border application tool includes a base plate, a spool for holding a roll of wallpaper border, an applicator cylinder for pressing border fed from the spool onto a wall, a paper guide for retaining the border on the application cylinder as it is fed from the spool, and an auxiliary roller that aids in applying the border, especially at corners of rooms. The spool that holds the paper has an adjustable platform that allows wallpaper border of different heights to be supported and applied. In addition, the border application tool includes following elements that provide smooth motion against a surface perpendicular to the wall. The base plate has a handle attached to its other surface.