If using fresh strawberries, wash and pick out any unwanted berries. Remove green tops (these can be dried too to include in herbal tea blends). Pat dry.
Cut fresh or frozen strawberries (thaw slightly) into equal size pieces, about 1/4" thick (too thin and they'll stick).
Place strawberries on mesh trays leaving a little space between each slice. Put in dehydrator and dry at 135°F (57°C) for 8 to 10 hours. Time will vary with each dehydrator, thickness of strawberries and with temperature and humidity levels in your house.
Rotate trays and check strawberries at 4 hours to get a sense of how quickly they are drying.
Finished strawberries will be pliable and leathery with no signs of moisture. As they cool they will become firmer. If you prefer crispier strawberries, dry longer. Let rest on tray until cooled, at least 2 hours.
Once cooled totally and completely, place in an airtight container (glass jar is best). To condition the strawberries and ensure they are absolutely dry throughout, watch and shake jar for next 7 days. If the strawberries soften greatly, clump together or if there is any sign of moisture on sides of jar - return to dehydrator. If all is good, store in a cool, dark place for a year or more.