Pack beets into jars. Leave 1-inch of headspace.
If desired, add ½ teaspoon salt to pint jars and 1 teaspoon to quarts. Top each jar with boiling water, leaving 1-inch headspace.
Use a bubble-releasing tool, a plastic knife or a wooden skewer to release bubbles from your jar by pushing the tool down all four sides of the jar.
If necessary, add more boiling water to adjust for any bubbles released.
Wipe the rim of the jar with a cloth dipped in white vinegar.
Set the lids in place.
Centering the lid, screw each lid on until it is fingertip-tight.
Carefully place the jars into the pressure canner.
Make sure that the water in your canner is only 2-3 inches (5-7.5 cm) high. Do not cover your lids with water. Add or carefully remove water if necessary.