The most powerful Open Source rich text editor with a modular & modern architecture, 200+ features, and built-in AI. Rock solid and fully customizable.

• Features documentation
• Online demos
• Main repository

• CKEditor 5 is a ready-to-use editor but also an editing framework with a robust API and tools such as CKEditor 5 inspector or package generator. This allows you to build your own plugins and solutions.
• Quality. 32,000+ tests, 100% code coverage, backed by a team of 40+ developers.
• Six different UI types. It fits any kind of application, e.g. Document Management System, email platform, CMS, LMS, CRM, chat.
• A large set of features (~200), including: paste from Office (Word, Google Docs), Markdown support, support for tables with table properties and column resizing, @mentions, find & replace, autoformatting, source editing, spell and grammar checker.
• Great accessibility support.
• Export to PDF/Word and import from Word.
• Exceptional collaboration features you will not find anywhere else:
  • Real-time collaborative editing (with ready-to-use backend with REST API, webhooks and detailed logging),
  • Comments and track changes,
  • Revision history.
• CKEditor AI — generate, transform, review and translate content with in-editor assistants or directly from your own code.

CKEditor 5 is open source under the GPL license. Several of the features above — CKEditor AI, real-time collaboration, comments, track changes, revision history, and document import/export — are premium features available under a commercial license. You can try the premium features for free or review the pricing.

CKEditor AI brings generative AI directly into the editor as a set of configurable, in-editor features:

• AI Chat — a conversational assistant inside the editor, with multi-turn conversations, chat history, web search, and context pulled from URLs, uploaded files, or external systems through the Model Context Protocol (MCP).
• AI Quick Actions — one-click transformations on selected text: rewrite, fix grammar and spelling, change tone, adjust length, summarize, continue writing, convert to bullet points, and translate.
• AI Review — proofreading and clarity, style, and tone checks against your own company style guide, with suggestions shown in context.
• AI Translate — full-document translation with a side-by-side review-and-accept workflow.
• Programmatic APIs — drive AI from your own code instead of the UI: trigger AI Chat and Quick Actions through the editor API, run stateless content transforms over a REST actions endpoint (responses streamed via Server-Sent Events), and transform whole HTML documents through a document-processing endpoint for server-side and batch workflows.

CKEditor AI works with Claude, Gemini and GPT models — or your own custom LLM — and supports on-premises deployment. Try the interactive demo or the programmatic demo.

• CKEditor 5 Builder - Scaffold a customized editor: choose an editor type, add the features you need, and download a ready-to-use setup.
• CDN Quick start guide
• npm or ZIP Quick start guide
• Getting started - Full introduction to CKEditor 5

• React | https://github.com/ckeditor/ckeditor5-react | Quick start + Live demo
• Next.js - Integrates through the official React component.
• Vue 3 | https://github.com/ckeditor/ckeditor5-vue | Quick start + Live demo
• Vue 2 | https://github.com/ckeditor/ckeditor5-vue2
• Angular | https://github.com/ckeditor/ckeditor5-angular

• https://github.com/ckeditor/ckeditor5-demos - Code examples for CKEditor setups available on demo pages
• https://github.com/ckeditor/ckeditor5-tutorials-examples - Code samples from tutorials on how to create plugins
• https://github.com/ckeditor/ckeditor5-collaboration-samples - A large set of examples on integrating CKEditor 5 with collaboration features

• Getting and setting data
• Creating a basic plugin
• Implementing a block widget
• Implementing an inline widget
• Using a React component in a widget

• CKEditor GitHub Awesome List - A curated list of awesome projects and resources related to CKEditor 5.
• CKBox - Ready-to-use file manager / digital asset manager with a native plugin for CKEditor 5.

CKEditor 5 is available under a dual-license model. You can use it for free under the terms of the GNU General Public License Version 2 or later, or obtain a commercial license from CKSource Holding sp. z o.o. Premium features, such as CKEditor AI and real-time collaboration, require a commercial license.

Note: CKEditor 4 reached its end of life on June 30, 2023, and the open source version is no longer maintained. We recommend starting new projects with CKEditor 5. Existing CKEditor 4 deployments can receive continued security updates and critical bug fixes through the commercial Extended Support Model.

• https://github.com/ckeditor/ckeditor4 - The main repository of CKEditor 4
• https://github.com/ckeditor/ckeditor4-releases - Official distribution releases of CKEditor 4
• https://github.com/ckeditor/ckeditor4-react - React integration for CKEditor 4
• https://github.com/ckeditor/ckeditor4-angular - Angular integration for CKEditor 4
• https://github.com/ckeditor/ckeditor4-vue - Vue integration for CKEditor 4