A dieline is a drawing of a box unfolded flat, at 1:1 scale. It shows where the board will be cut, where it will be folded and how far the printed artwork must extend. Every box, however simple, starts with this plan.
What is a dieline for?
The same file serves three trades at once:
- The designer places the artwork on the right panels (front, sides, top) without running text across a fold or onto the glue flap.
- The printer lays the boxes out on the press sheet (imposition) and checks that there is enough bleed.
- The die maker turns the lines into cutting knives and creasing rules.
If the dieline is off by two millimeters, the box won’t close, the product won’t fit, or the artwork lands in the wrong place. That’s why you approve the dieline before you design, not the other way around.
What a dieline contains
- Cut lines: the outline of the box and any interior cutouts (window, handle, notch).
- Crease lines: the fold lines, pressed into the board so it folds cleanly.
- Perforations, if any: a tear strip or a detachable section.
- Bleed: a margin around the outline where the print extends past the cut, so no white edge shows after cutting.
- Dimensions: length, width and height, plus the type of dimensions used (inside, outside or manufacturing).
Each line type has its own color and layer so that machines and software can recognize it. We cover these conventions in How to read a dieline: cut, crease and perforation lines.
Where does a dieline come from?
Most boxes follow well-known styles: the regular slotted container, the reverse tuck end carton, the bakery box with folded corners, the pizza box. These families have standard codes across the industry (FEFCO for corrugated board, ECMA for folding cartons), explained in our article on the standards.
A style alone isn’t enough: you need your dimensions and the thickness of your board. A 60 × 40 × 120 mm carton in 0.5 mm board doesn’t have the same dieline as one in 1.5 mm microflute: the flaps, glue flaps and clearances all change. That’s exactly what a parametric generator calculates: you pick the style, enter your dimensions and material, and the dieline redraws itself.
The most common mistakes
- Resizing a dieline in a drawing program: board thickness and clearances don’t scale with it, and the box no longer closes.
- Mixing up inside and outside dimensions (see Inside, outside or manufacturing dimensions).
- Printing the dieline itself: it must stay on its own layer, as a non-printing spot color.
- Forgetting the bleed: a white edge appears at the slightest cutting shift.