Please note that CKEditor 4 reached its End of Life (EOL) in June 2023. From then on, it receives no more updates, new features, bug fixes, and most importantly, security patches.
If you have an active CKEditor 4 subscription and need help, you can contact our support team. If you are not ready to migrate yet, for a limited time we are offering a paid Extended Support Model that will protect you against security vulnerabilities and/or breaking third-party API changes.
Documentation on creating custom plugins for CKEditor 4, including hands-on tutorials, is located in our Plugin SDK Introduction article. The working demos of the plugins created in the tutorials are available in CKEditor 4 Examples.