This extension is part of the TYPO3 Core.

Installation with Composer

Check whether you are already using the extension with:

composer show | grep rte

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

typo3/cms-rte-ckeditor       v12.4.11

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

composer require typo3/cms-rte-ckeditor

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

Installation without Composer

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 Admin Tools > Extensions module.
  2. Click the Activate icon for the RTE CKEditor extension.
Extension manager showing RTE CKEditor extension

Extension manager showing RTE CKEditor extension