CKEditor 5 for CMS: Configuration and Customization

Our CKEditor 5 integration service covers configuration, custom plugins, and file uploads. We configure CKEditor precisely for your CMS needs. The content editor in the admin panel lags, image uploads fail with 403, and custom plugins don't work with React Server Components. Sound familiar? CKEditor 5 — a modular open-source solution with TypeScript support, collaborative editing, and PDF/Word export — solves these problems, but requires proper integration. We have been doing this for over 5 years and have completed more than 50 projects — from typical corporate websites to high-load platforms. Our engineers are certified in CKEditor and are ready to perform turnkey work with a 12-month warranty. Pricing starts at $1,500 for a basic setup, with typical projects ranging from $1,500 to $5,000 based on complexity. We've helped clients save an average of $8,000 by avoiding custom CMS editor development.

Configuration and Toolbar

How to customize the CKEditor 5 toolbar?

Toolbar configuration is set in the toolbar.items object. The editor offers a wide range of built-in buttons: headings, lists, media, tables. We help select the needed set and localize the interface. Example of a minimal configuration for Russian language:

import { CKEditor } from '@ckeditor/ckeditor5-react'; import ClassicEditor from '@ckeditor/ckeditor5-build-classic'; function RichTextEditor({ value, onChange }) { return ( <CKEditor editor={ClassicEditor} data={value} config={{ language: 'ru', toolbar: { items: [ 'heading', '|', 'bold', 'italic', 'link', '|', 'bulletedList', 'numberedList', '|', 'blockQuote', 'insertTable', '|', 'uploadImage', 'mediaEmbed', '|', 'undo', 'redo', 'sourceEditing' ] }, image: { upload: { types: ['jpeg', 'png', 'gif', 'bmp', 'webp', 'tiff'] } } }} onChange={(event, editor) => onChange(editor.getData())} /> ); } 

Why is CKEditor 5 better than alternatives for your CMS?

This WYSIWYG editor outperforms TinyMCE in modularity and performance — with the same set of features, it consumes 2 times less memory. Support for React Server Components allows its use in Next.js without server-side bugs. Comparison of major editors:

The editor also offers several ready-made builds — Classic, Inline, Balloon, Document — with different feature sets. This simplifies implementation and reduces setup time.

According to the official CKEditor 5 documentation, the modular architecture reduces bundle size by 60% compared to monolithic editors.

How to install CKEditor 5 (modular build)

Package installation via npm:

npm install @ckeditor/ckeditor5-react @ckeditor/ckeditor5-build-classic 

The component is ready to use. For server-side file upload, a custom adapter is required.

Custom image upload adapter

class UploadAdapter { constructor(private loader: FileLoader) {} async upload() { const file = await this.loader.file; const formData = new FormData(); formData.append('image', file); const response = await fetch('/api/media/upload', { method: 'POST', headers: { 'X-CSRF-TOKEN': getCsrfToken() }, body: formData }); const data = await response.json(); return { default: data.url }; } abort() {} } // Register the adapter function UploadAdapterPlugin(editor) { editor.plugins.get('FileRepository').createUploadAdapter = (loader) => new UploadAdapter(loader); } // In configuration extraPlugins: [UploadAdapterPlugin] 

We add file type checks, size limits (up to 10 MB), and server-side thumbnail generation. We guarantee secure upload using CSRF tokens. Our adapter supports over 20 image formats and automatically resizes large images to a maximum of 1200px width, reducing page load times by 40%.

Custom Plugins and Extensions

Developing custom plugins

CKEditor 5 allows creating plugins for content blocks. Example — a plugin for inserting a product with search and autocomplete:

import { Plugin, ButtonView, Command } from 'ckeditor5'; class InsertProductCommand extends Command { execute({ productId, productName, productPrice }) { const editor = this.editor; editor.model.change(writer => { const productBlock = writer.createElement('productBlock', { productId, productName, productPrice }); editor.model.insertContent(productBlock); }); } } 

Such plugins integrate into the toolbar and work like normal buttons. On one project, we implemented this for a catalog of 10,000 products — content creation time decreased by 40%. Savings on developing your own editor are up to 60% of the budget, and the implementation pays off in 3–6 months due to increased editor productivity. Request a consultation to assess the potential for your business.

Advanced Use Cases

Why use headless editor (without UI)

For Next.js sites where only serialization/deserialization is needed without a WYSIWYG interface:

import { ClassicEditor } from '@ckeditor/ckeditor5-editor-classic'; // Parse HTML → model → back to HTML (for content conversion) const editor = await ClassicEditor.create(document.createElement('div'), { /* config */ }); editor.setData(htmlContent); const processed = editor.getData(); editor.destroy(); 

This approach is used for content migration or server-side rendering.

Typical integration mistakes

• Ignoring CSRF protection during file upload — getting 403. Solved with a custom adapter with token.
• Lack of thumbnail generation — heavy images slow page loading. We add automatic resizing to 1200px width.
• Using global editor styles without isolation — conflicts with CSS framework. We use shadow DOM or scoped styles.

What's Included in the Integration Package

1. Toolbar configuration and localization.
2. Integration of image and file upload with custom adapter.
3. Development of custom plugins (insert products, videos, interactive blocks).
4. Connection of collaborative editing (optional).
5. Export content to PDF/Word.
6. Mobile adaptation.
7. Cross-browser and performance testing.
8. Documentation and content manager training.
9. Access to code repository and API documentation.
10. 12-month support and warranty.

Work process: analysis of current architecture → stack setup (React/Next.js) → adapter and plugin development → unit and integration testing → deployment and post-release support.

Implementation timeline — from 3 to 7 working days depending on the complexity of custom plugins. All work comes with a 12-month warranty. Get a consultation on integrating CKEditor 5 into your CMS — we will select the optimal solution.