---
type: faq
title: "What are A-series (A4, A5) paper sizes?"
description: "The A-series is the international ISO paper standard where each size is exactly half the one before it, so proportions stay consistent as you scale up or d"
resource: https://www.4over4.com/faqs/sizes-specs/what-are-a-series-a4-a5-paper-sizes
tags: ["Printing Terms Glossary", "faq"]
timestamp: 2026-07-20T18:54:40.856Z
---

# What are A-series (A4, A5) paper sizes?

The A-series is the international ISO paper standard where each size is exactly half the one before it, so proportions stay consistent as you scale up or d

Part of the **Printing Terms Glossary** hub. See [all faq concepts](index.md).

- Page type: faq
- Hub: Printing Terms Glossary
- URL: https://www.4over4.com/faqs/sizes-specs/what-are-a-series-a4-a5-paper-sizes