Tresorit

Tresorit is a Swiss-Hungarian end-to-end encrypted (E2EE) cloud storage and collaboration provider, founded in 2011 and headquartered in Zurich, Switzerland, with a major research and development office in Budapest, Hungary. The platform provides zero-knowledge file storage, sync and sharing, positioned as a privacy-first alternative to Dropbox, Google Drive and OneDrive, and lets customers choose the geographic location where their data is stored to meet data-residency and compliance requirements.

In July 2021, Swiss Post — Switzerland’s national postal service — acquired a majority stake in Tresorit as part of its push into secure digital infrastructure. Tresorit continues to operate under its own brand with roughly 138 employees as of 2026, and its 2011 founding date makes it one of the earliest commercial E2EE productivity vendors, giving it over a decade of operating history versus newer zero-knowledge entrants such as Proton Drive and Sync.com.

As a Swiss Post-backed company, Tresorit’s roadmap now reflects its parent’s digital-infrastructure strategy rather than pure venture-scale growth targets. Independent reviews consistently rate its encryption implementation highly, and there is no public record of a breach in its core E2EE architecture, though marketing language describing it as the "most secure" option should be read as review-site framing rather than an independent lab benchmark.