Run a piece of thin cardboard or folded paper in between the door and the jamb to identify the start and end point for the area that needs to be planed.
Plane hinge side of door.
But frequently the solution is on the hinge side.
Immobilize it with a doorstop and plane it in place see step 3.
Running the plane in this direction will create smooth cuts instead of chunky bumpy cuts.
Hold a belt sander plane or power plane at about a 45 degree angle to the edge of the door and remove material to the witness line.
A hinge can often work loose binding the door against the frame.
Complete one pass per stroke with a hand or power planer with.
Plane the hinge or lock sides of the door in the same direction as the wood grain applying light pressure to remove very small amounts of wood at a time.
That may be difficult on older painted doors.
Turn the door so.
Before trying to trim the door open it and examine the hinges.
On many doors the grain runs from top to bottom instead of side to side.
Test each screw by tightening it with a screwdriver.
But for maximum control and to plane longer portions take the door off its hinges with a screwdriver or drill.
The hinge master mortising jigs have been designed to route most of the various hinge sizes of todays door industry.
The radius of the mortise is determined.