# Perforation

> A perforation is a series of cuts separated by uncut bridges that creates a controlled tear or separation line.

Canonical: https://dielinemaker.com/glossary/perforation
Last updated: 2026-10-26

Geometry

## What it means in packaging

The cut lengths and remaining bridges affect how easily the material tears. A dashed line drawn for appearance does not necessarily define a usable perforation for a cutter. Its production meaning must be assigned explicitly.

## A practical example

A display carton can use a perforated strip so the shop removes its upper section after delivery.

## What to check

Test opening force and accidental tearing with the actual material; a screen preview cannot establish either.

## Use it in your project

- [Print checks and production exports](https://dielinemaker.com/learn/print-checks-and-exports)
- [Check a dieline before printing](https://dielinemaker.com/blog/how-to-check-a-dieline)

## Related terms

- [Cut line](https://dielinemaker.com/glossary/cut-line) — A cut line indicates a path where material is intended to be cut through, such as a package outline or window.
- [Crease](https://dielinemaker.com/glossary/crease) — A crease is a controlled deformation of board that guides a fold without cutting through the material.
- [Packaging proof](https://dielinemaker.com/glossary/proof) — A packaging proof is a review version used to check a defined aspect of a design before production.

## Related

- [Packaging glossary](https://dielinemaker.com/glossary)