CryptPad

The suite provides a collection of web‑based collaborative applications—including rich‑text documents, spreadsheets, presentations, forms, kanban boards, code editors, and whiteboards—that synchronize edits in real time. All user data is encrypted in the browser before transmission, so the server stores only ciphertext and cannot read the content. Authentication relies on cryptographic keys derived from a username and password, preventing the server from seeing credentials.

It targets individuals, teams, and organizations that need shared editing while keeping data private, especially those concerned about server‑side breaches or unwanted surveillance. The software can be run on public instances or self‑hosted, offering a free tier without subscription and an open‑source AGPL‑3.0 licence, which allows modification and redistribution.

Distinctive aspects include end‑to‑end encryption of every document, a design that limits information exposed to operators, and a deployment model that supports both Docker‑based production and local development. The project maintains a three‑month release cycle, provides translation tools via Weblate, and offers documentation for secure installation and best‑practice usage.