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Cloud-hosted licensing uses CKSource's CDN and follows usage-based billing. Self-hosted licensing requires a custom plan arranged through sales, allowing you to host the editor on your own infrastructure.

Yes, but only for validation. CKEditor 5 checks the license key against CKEditor's servers occasionally. It does not send your user data or content—only the key and the domain. This verification can be disabled for offline environments via the verifyLicense: false config (though you must ensure compliance).

// Or, if using a config object: ClassicEditor .create( document.querySelector( '#editor' ), licenseKey: 'Your-License-Key-Here', // other config options... ) .catch( error => console.error( error ) );

However, when moving from development to production, especially when unlocking premium features, you will encounter the .

Real-time collaborative editing, track changes, comments, revision history. (Requires Cloud Services key) Advanced Compliance Pagination, Document Outline, Case Change, Advanced Tables. Yes 4. How to Get a CKEditor 5 License Key

The config.licenseKey property became a mandatory requirement with the release of CKEditor 5 v44.0.0 . Users upgrading from older versions must add this property to their configuration.