Configuration Reference

YAML Configuration Reference

When configuring the CKEditor using YAML, these are the property names that are currently used:


Configuring transformations kicks in the RteHtmlParser API of TYPO3, to only allow certain HTML tags and attributes when saving the database or leaving the database to the RTE. However, defining transformations towards RTE is not really necessary anymore. Defining more strict processing options when storing content in the database also needs to be ensured that CKEditor allows this functionality too.

This configuration option was previously built within RTE.proc and can still be overridden via Page TSconfig. Everything defined via “processing” is available in RTE.proc and triggers RteHtmlParser options.


Editor contains all RTE-specific options. All CKEditor-specific options, which one could imagine are available under “config” property and handed over to CKEditor’s instance-specific config array.

All other sub-properties are usually handled via TYPO3 and then injected in the CKEditor instance at runtime. This is useful for registering extra plugins, like the TYPO3 core does with a custom typo3-link.js plugin, or adding third-party plugins like handling images.



Configuration options For a list of all options see


Some configuration options from the official CKEditor 5 documentation do not apply to TYPO3, since they are related to specific plugins (for example: CKBox, CloudServices) which are not bundled in TYPO3's CKEditor build.


defines the editor’s UI language, and is dynamically calculated (if not set otherwise) by the backend users’ preference.


defines the language of the data, which is fetched from the sys_language information, but can be overridden by this option as well. For referencing files, TYPO3's internal "EXT:" syntax can be used, for using language labels, TYPO3's "LLL:" language functionality can be used.


defines the CSS file of the editor and the styles that can be applied.


  - "EXT:rte_ckeditor/Resources/Public/Css/contents.css"

This is the default, as defined in EXT:rte_ckeditor/Configuration/RTE/Editor/Base.yaml.


Defines headings available in the heading dropdown.


    - { model: 'heading2', view: 'h2', title: 'Heading 2' }

Defines styles available in the style dropdown.


    - { name: "Lead", element: "p", classes: ['lead'] }

Imports custom CKEditor plugins. See EXT:rte_ckeditor/Configuration/RTE/Editor/Plugins.yaml or How do I create a custom plugin? for examples.

Page TSconfig

We recommend you to put all configurations for the preset in the YAML configuration. However, it is still possible to override these settings through the page TSconfig.

You can find a list of configuration properties in the Page TSconfig reference, chapter RTE.