---
type: guide
title: "Invitation Format Explained, From Flat Cards to Gatefold Suites"
description: "Flat, side fold, top fold or gatefold: how each invitation format is built, the panel math that stops a fold buckling, and what each one costs to print and mail."
resource: https://www.4over4.com/guide/invitation-format-the-complete-guide
tags: ["guide"]
generated:
  by: "process:4over4-mapp-build"
  at: 2026-09-08T01:19:44.025Z
timestamp: 2026-09-08T01:19:44.025Z
sources:
  - resource: https://www.4over4.com/guide/invitation-format-the-complete-guide
    title: "Invitation Format Explained, From Flat Cards to Gatefold Suites"
status: stable
---

# Invitation Format Explained, From Flat Cards to Gatefold Suites

Flat, side fold, top fold or gatefold: how each invitation format is built, the panel math that stops a fold buckling, and what each one costs to print and mail.

See [all guide concepts](index.md).

- Page type: guide
- URL: https://www.4over4.com/guide/invitation-format-the-complete-guide