CryptPad is an open-source collaborative office suite built around end-to-end encryption and a zero-knowledge architecture. It provides collaborative applications for documents, spreadsheets, presentations, forms, whiteboards, code, and file storage, allowing users to work together while the service is designed so the provider cannot access content in readable form. The project is associated with French company XWiki SAS and is available both as software that can be self-hosted and through the public CryptPad service.