---
type: faq
title: "What is a Side Seam envelope and how does it differ from a Diagonal Seam envelope?"
description: "The seam is where the back panels of an envelope are folded and glued. Invitation A-sizes use side seams, while most commercial envelopes use diagonal seam"
resource: https://www.4over4.com/faqs/business-stationery/what-is-a-side-seam-envelope-and-how-does-it-differ-from-a-diagonal-seam-envelope
tags: ["Business Stationery", "faq"]
timestamp: 2026-07-20T18:54:40.856Z
---

# What is a Side Seam envelope and how does it differ from a Diagonal Seam envelope?

The seam is where the back panels of an envelope are folded and glued. Invitation A-sizes use side seams, while most commercial envelopes use diagonal seam

Part of the **Business Stationery** hub. See [all faq concepts](index.md).

- Page type: faq
- Hub: Business Stationery
- URL: https://www.4over4.com/faqs/business-stationery/what-is-a-side-seam-envelope-and-how-does-it-differ-from-a-diagonal-seam-envelope