A hinge can often work loose binding the door against the frame.
Plane hinge side of door.
But frequently the solution is on the hinge side.
Use a pencil to mark this area on the side of the door not on the edge.
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.
Running the plane in this direction will create smooth cuts instead of chunky bumpy cuts.
Step 2 use your ruler to measure 1 8 inch from the jamb to the start and end points on the door.
On many doors the grain runs from top to bottom instead of side to side.
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.
Immobilize it with a doorstop and plane it in place see step 3.
People usually try to plane off the edge.
Test each screw by tightening it with a screwdriver.
Turn the door so.
That may be difficult on older painted doors.
Before trying to trim the door open it and examine the hinges.
Complete one pass per stroke with a hand or power planer with.
The radius of the mortise is determined.