Uffizi gallery has two entrances, one for pre-booked tickets and one for the offline tickets which you have to purchase on the spot. If you have purchased a ticket online, for example the Skip the Line Uffizi Gallery tickets from Headout, you can straight away head to Door 3 where you can show your booking and pick up your tickets for going up to the gallery.
If you haven’t booked your tickets online then you have a long wait ahead of you, as you have to stop near the Door 2. These lines can stretch long distances especially during the peak summer season. Door 1 is reserved for large groups, school groups and special tours.