CryptPad

CryptPad is a French collaboration suite where everything is end-to-end encrypted, including the documents themselves: the server stores only ciphertext, so not even the operator can read your work. It bundles rich text documents, spreadsheets, presentations, forms, kanban boards, whiteboards, and code pads in one browser-based workspace.

Real-time collaboration works like mainstream suites: share a link, co-edit live, track changes, and manage team access through encrypted team drives. No account is required for basic use, and registration itself asks for no personal data. The open source AGPL code can be audited or self-hosted on your own servers.

Key features:

• End-to-end encryption on every document, unreadable by the server operator
• Full suite with docs, sheets, slides, forms, kanban, whiteboard, and code
• Real-time co-editing with cursors, history, and link sharing
• Team drives for encrypted shared folders with role-based access
• No personal data required to register or collaborate
• Self-hostable AGPL code for complete infrastructure control
• Free tier with 1 GB of encrypted storage

CryptPad is developed by XWiki SAS in Paris, France, with its flagship instance hosted in Europe and operated under GDPR. The zero-knowledge design means compliance is structural: there is no readable customer content to hand over, subpoena, or leak.

Ideal for journalists, NGOs, public bodies, and any team that wants Google Docs style collaboration without trusting the host with the content.