Run the lid under hot water for 30 to 60 seconds
Tap the lid edge gently with a spoon
Grip the lid with a rubber glove or rubber band
Use a jar opener tool
Strike the lid rim lightly against a countertop edge
Pry the lid edge slightly with a spoon to release pressure
Ask someone else to try with better grip strength
Use a towel for extra traction
Turn the jar upside down and tap the bottom
If needed, use pliers carefully on the lid edge