Why a 4 × 6 print holds two 2 × 2 photos, not six
Six 2-inch squares fill a 4 × 6 inch print exactly, with nothing left for a border. A lab may trim a little from the edges of a print, and a layout with no margin would then lose part of the outer photos.
PixVibe's print sheet leaves a 4 mm margin around the page and 2 mm between photos. With that room, a 4 × 6 sheet fits one 2-inch column across and two rows down: 2 copies. If you need more, the 2L option (127 × 178 mm, the same as 5 × 7 in) fits 6, and a Letter or A4 page fits 15.














