RTE Setup 

Complete guide for configuring the RTE (Rich Text Editor) with CKEditor image support.

Table of Contents

RTE Configuration 

Basic Setup 

Create or update your RTE preset configuration:

EXT:my_ext/Configuration/RTE/Default.yaml 
imports:
  # Import default RTE config
  - { resource: "EXT:rte_ckeditor/Configuration/RTE/Default.yaml" }
  # Import image plugin configuration
  - { resource: "EXT:rte_ckeditor_image/Configuration/RTE/Plugin.yaml" }

editor:
  config:
    # Restore image plugin (default config removes it)
    removePlugins: null

    toolbar:
      items:
        - '|'
        - insertimage
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Register Preset 

EXT:my_ext/ext_localconf.php 
$GLOBALS['TYPO3_CONF_VARS']['RTE']['Presets']['default']
    = 'EXT:my_ext/Configuration/RTE/Default.yaml';
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Enable Preset 

Page TSConfig 
RTE.default.preset = default
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Advanced RTE Configuration 

Custom Allowed Extensions 

editor.externalPlugins.typo3image.allowedExtensions

editor.externalPlugins.typo3image.allowedExtensions
type

string

Default

Value from $GLOBALS['TYPO3_CONF_VARS']['GFX']['imagefile_ext']

Comma-separated list of allowed image file extensions for the RTE image plugin.

Restricts which file types can be selected through the image browser.

Example:

editor:
  externalPlugins:
    typo3image:
      route: "rteckeditorimage_wizard_select_image"
      allowedExtensions: "jpg,jpeg,png,gif,webp"
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If not specified, falls back to the global TYPO3 configuration at $GLOBALS['TYPO3_CONF_VARS']['GFX']['imagefile_ext']

Multiple RTE Presets 

Different configurations for different content types:

EXT:my_ext/Configuration/RTE/Simple.yaml 
imports:
  - { resource: "EXT:rte_ckeditor/Configuration/RTE/Minimal.yaml" }
  - { resource: "EXT:rte_ckeditor_image/Configuration/RTE/Plugin.yaml" }

editor:
  config:
    removePlugins: null
    toolbar:
      items:
        - insertimage
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Different presets for different fields 
# Different presets for different fields
RTE.default.preset = default
RTE.config.tt_content.bodytext.preset = full
RTE.config.tt_content.header.preset = simple
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