Register marks are small targets, crosses, or other indicators placed outside the trimmed page area to help printers align multiple impressions accurately. They are especially necessary when separate colors, plates, or sides of a sheet must fall in exactly the same position. In illustrated poetry books or color broadsides, poor registration can cause words, borders, or images to appear doubled or shifted. Proper registration ensures that visual elements support the poem rather than becoming accidental distractions.

Register marks are alignment targets printed outside the final page area. Printers use them to keep colors, images, and both sides of a sheet accurately positioned during presswork.