Turn the door so.
Plane hinge side of door.
Test each screw by tightening it with a screwdriver.
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.
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.
On many doors the grain runs from top to bottom instead of side to side.
Immobilize it with a doorstop and plane it in place see step 3.
That may be difficult on older painted doors.
A hinge can often work loose binding the door against the frame.
The hinge master mortising jigs have been designed to route most of the various hinge sizes of todays door industry.
People usually try to plane off the edge.
Running the plane in this direction will create smooth cuts instead of chunky bumpy cuts.
But for maximum control and to plane longer portions take the door off its hinges with a screwdriver or drill.
Complete one pass per stroke with a hand or power planer with.
But frequently the solution is on the hinge side.
Before trying to trim the door open it and examine the hinges.
Step 2 use your ruler to measure 1 8 inch from the jamb to the start and end points on the door.