Dieline, cutline and die: what is the difference?
The three words get used interchangeably, but they mean different things on a production floor:
- Dieline: the complete technical drawing of the flat package, with every line type (cut, crease, perforation, bleed) on separate layers.
- Cutline: just the thru-cut outline, the line where the blank is separated from the sheet. It is one part of the dieline.
- Die (or cutting die): the physical tool made from the dieline. In conventional production it is a board with steel cutting and creasing rules bent to match the drawing. Digital cutting tables skip the tool and follow the vector file directly with a knife and a creasing wheel.
The line types on a dieline
Line types are separated by colour and layer so the printer, die-maker and cutter each know what to do. Exact colours vary between printers, so always follow your printer's spec, but the convention looks like this:
| Line | What it does | Typical style |
|---|---|---|
| Cut | Cuts all the way through the board. | Solid line, often magenta or red |
| Crease (score) | Compresses the board so it folds cleanly without cracking. | Dashed line, often cyan or green |
| Perforation | Alternating cuts and ties for tear-open strips and dispensers. | Short dashes or dots |
| Bleed | How far artwork must extend past the cutline, usually 3 mm (⅛ in). | Thin line outside the cutline |
| Safe zone | Area inside folds and cuts where text and logos are protected from trimming. | Thin line inside the cutline |
Bleed and safe zones are covered in detail in Packaging Bleed, Trim & Safe Zone Explained.
The parts of a folding carton dieline
A tuck-end carton such as a reverse tuck end box has the same basic parts as most retail packaging:
- Body panels: front, back and two sides, which wrap around the product.
- Glue flap (manufacturer's joint): a narrow flap glued to the last panel to form the tube.
- Tuck flaps: the closures that slide inside the box at the top and bottom.
- Dust flaps: the small side flaps that fold in under the tucks and keep out dust.
Why board thickness changes the dieline
A dieline is not just the product's dimensions drawn flat. Board has thickness (caliper), and every fold uses some of it. Tuck flaps must be slightly narrower than the panel they close into, and inner panels must allow for the board wrapped around them, or the box will bulge and the tucks will jam. The caliper guide shows the allowances DielineKit applies automatically.
How to get a dieline
- Measure the product and decide on inside dimensions. See how to measure box dimensions.
- Pick a structure: tuck-end carton, mailer, shipping box or sleeve. The box types catalog compares them.
- Generate the dieline from those dimensions and your board caliper, either from your printer or with a generator such as the DielineKit studio, which you can start from a standard size template.
- Check it folds: print it at 100% on card, or fold it in 3D, before committing to artwork.
- Place artwork on a separate layer, extending into the bleed, and send a 1:1 vector PDF or DXF to your printer for approval.
Common dieline mistakes
- Exporting at the wrong scale. The file must be 1:1; check one panel with a ruler on a test print.
- Merging the dieline into the artwork layer, so it prints on the finished box.
- Mixing up inside and outside dimensions, which makes the box too tight or too loose.
- Ignoring board caliper, especially on corrugated board, where a few millimetres matter.
- Putting text or barcodes across a crease, where they will distort when folded.