CryptPad
cryptpad.fr
An end-to-end encrypted office suite providing zero-knowledge collaboration on documents, spreadsheets, and whiteboards.
CryptPad delivers real-time collaborative documents, spreadsheets, kanban boards, and forms with encryption that runs entirely in the browser. The hosting server never sees your content — the zero-knowledge architecture means even a subpoena to CryptPad yields nothing readable.
Why it is useful
Most private collaboration tools are privacy policies, not privacy architecture. CryptPad encryption happens client-side before anything leaves your browser, so the server is structurally blind to your content. It is the only Google Docs alternative where the provider genuinely cannot read your files.