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guideSetting the UI language

The UI of the editor can be localized. CKEditor 5 currently supports around 20 languages and the number is growing.

If you want to help translate CKEditor 5 into your native language, join the CKEditor 5 project on Transifex. Your help will be much appreciated!

See the demo of the editor in German:

This is CKEditor 5.

# Loading additional languages from CDN, npm and zip file

By default, the editor will display in English. This is the language built into the ckeditor.js files. In order to change the language of the editor UI, you need to load additional language file(s). Check out the following sections to see how to do that:

Next, you can configure the editor to use the chosen language:

    .create( document.querySelector( '#editor' ), {
        // The language code is defined in the standard.
        language: 'de'
    } )
    .then( editor => {
        console.log( editor );
    } )
    .catch( error => {
        console.error( error );
    } );


To use different language than default one (English), you need to load the editor together with the preferred language:

<script src="[version.number]/[distribution]/ckeditor.js"></script>
<script src="[version.number]/[distribution]/translations/[lang].js"></script>

For example:

<script src=""></script>
<script src=""></script>

See CDN installation guides for more information.

# npm

After installing the build from npm, languages will be available at node_modules/@ckeditor/ckeditor5-build-[name]/build/translations/[lang].js.

Single language can be loaded directly to your code by importing e.g. '@ckeditor/ckeditor5-build-classic/build/translations/de.js'.

See npm installation guides for more information.

# Zip

All additional languages are included in the .zip file. You need to include ckeditor.js file together with the chosen language file:

<script src="[ckeditor-path]/ckeditor.js"></script>
<script src="[ckeditor-path]/translations/de.js"></script>

See zip installation guides for more information.

# Building the editor using a specific language

Currently, it is possible to change the UI language at the build stage and after the build. A single build of the editor supports the language which was defined in the CKEditor 5 webpack plugin’s configuration. See the whole translation process to see how you can change the language later.

If you use one of the predefined editor builds, refer to Creating custom builds to learn how to change the language of your build.

If you build CKEditor from scratch or integrate it directly into your application, then all you need to do is to:

  1. Install the @ckeditor/ckeditor5-dev-webpack-plugin package:

    npm install --save @ckeditor/ckeditor5-dev-webpack-plugin
  2. Add it to your webpack configuration:

    Note: The language code is defined in the ISO 639-1 standard.

    const CKEditorWebpackPlugin = require( '@ckeditor/ckeditor5-dev-webpack-plugin' );
    // Define webpack plugins ...
        plugins: [
            new CKEditorWebpackPlugin( {
                // Main language that will be built into the main bundle.
                language: 'en',
                // Additional languages that will be emitted to the `outputDirectory`.
                // This option can be set to an array of language codes or `'all'` to build all found languages.
                // The bundle is optimized for one language when this option is omitted.
                additionalLanguages: 'all',
                // Optional directory for emitted translations. Relative to the webpack's output.
                // Defaults to `'translations'`.
                // outputDirectory: 'ckeditor5-translations',
                // Whether the build process should fail if an error occurs.
                // Defaults to `false`.
                // strict: true,
                // Whether to log all warnings to the console.
                // Defaults to `false`.
                // verbose: true
            } ),
            // Other webpack plugins...
    // ...
  3. Run webpack. If the additionalLanguages option is not set, the CKEditor plugin for webpack will replace the t() function call parameters used in the source code with localized language strings. Otherwise the CKEditor plugin for webpack will replace the t() function call parameters with short ids and emit the translation files that should land in the 'translations' directory (or different, if the outputDirectory option is specified).

  4. If you want to change the language after the build ends, you will need to edit the index.html file, add the translation file and set the UI language to the target one.

    <script src="../build/ckeditor.js"></script>
    <script src="../build/translations/pl.js"></script>
            .create( document.querySelector( '#editor' ), {
                language: 'pl'
            } )
            .then( editor => {
                window.editor = editor;
            } )
            .catch( err => {
                console.error( err.stack );
            } );

We are aware that the current localization method is not sufficient for some needs. It does not support different bundlers (e.g. Rollup or Browserify). We will be extending the localization possibilities in the future.

You can read more about the used techniques in the “Implement translation services” issue and “Implement translation services v2” issue.