---
title: "Installation"
manual: "Link Validator"
version: "14.3"
permalink: "https://docs.typo3.org/permalink/typo3/cms-linkvalidator:installation@14.3"
source: "Installation/Index.rst"
rendered: "2026-09-22T20:17:07+00:00"
---

# Installation {#installation}

This extension is part of the TYPO3 Core, but not installed by default.

**Table of contents**

-   [Installation with Composer](https://docs.typo3.org/permalink/typo3/cms-linkvalidator:installation-with-composer@14.3)
-   [Classic installation without Composer](https://docs.typo3.org/permalink/typo3/cms-linkvalidator:classic-installation-without-composer@14.3)
-   [Next step](https://docs.typo3.org/permalink/typo3/cms-linkvalidator:next-step@14.3)

## Installation with Composer {#installation-composer}

Check whether you are already using the extension with:

```bash
composer show | grep linkvalidator
```

This should either give you no result or something similar to:

```none
typo3/cms-linkvalidator       v12.4.11
```

If it is not installed yet, use the `composer require` command to install
the extension:

```bash
composer require typo3/cms-linkvalidator
```

The given version depends on the version of the TYPO3 Core you are using.

## Classic installation without Composer {#installation-classic}

In an installation without Composer, the extension is already shipped but might
not be activated yet. Activate it as follows:

1.  In the backend, navigate to the **System > Extensions**
    module.
1.  Click the **Activate** icon for the LinkValidator extension.

![Extension manager showing LinkValidator extension](../Images/ActivateLinkValidator.png)

## Next step {#installation-next}

LinkValidator uses the HTTP request library shipped with TYPO3.
Please have a look in the [Global Configuration](https://docs.typo3.org/m/typo3/reference-coreapi/main/en-us/Configuration/Typo3ConfVars/Index.html#typo3ConfVars),
particularly at the HTTP settings.

There, you may define a default timeout. Generally, it is recommended
to always specify timeouts when working with the LinkValidator.