Run the lid under hot water for 30 to 60 seconds
Tap the lid edge firmly with a spoon
Grip the lid with a rubber glove or rubber band
Use a jar opener tool
Strike the lid edge lightly with the back of a butter knife
Pry the lid edge up slightly with a spoon to release the seal
Turn the jar upside down and tap the bottom
Ask someone else to try opening it
Use a towel for extra grip
Place the lid under hot water again and retry
Open the jar with a strap wrench
Break the vacuum seal by lifting one side of the lid edge
Use pliers on the lid if it is metal
Avoid using excessive force to prevent breakage