The door frame support is a practical installation tool for the secure and precise fitting of door frames. It stabilizes and supports the door frame during the foaming of the wall joint, ensuring a straight and stable installation. The door frame support is made from high-quality materials and impresses with its robust and durable construction. The telescopic square tube made of anodized aluminum allows for flexible adjustment to the respective door width. The millimeter scale and locking screw ensure precise work. The cross-shaped pressure plate with felt protection is gentle on sensitive door frames. The detachable clamping brackets with enlarged clamping surfaces and removable extensions enable easy and secure insertion of the door frame.