---
title: "Extensions (Admin Tools)"
manual: "Getting Started"
version: "13.4"
permalink: "https://docs.typo3.org/permalink/t3start:admin-tools-extensions@13.4"
source: "Concepts/Backend/AdminTools/Extensions.rst"
modified: "2026-09-15T08:44:38+00:00"
---

# Extensions (Admin Tools)

Only available if [`typo3/cms-extensionmanager`](https://packagist.org/packages/typo3/cms-extensionmanager) is installed.

The backend module **Admin Tools > Extensions**, also called
"Extension Manager", can be used in Composer-based extensions to view which
TYPO3 extensions are installed. In non-Composer installation (not in the scope
of this guide) they can also be used to install and activate extensions:
[Installing an Extension using the Extension Manager](https://docs.typo3.org/m/typo3/reference-coreapi/13.4/en-us/Administration/ExtensionManagement/ClassicMode/Index.html#extension-install).