Tresorit is a cloud storage and secure file collaboration company founded in 2011. It focuses specifically on end-to-end encrypted cloud storage solutions designed to provide enhanced data protection by allowing users to securely store, share, sync, and manage sensitive files in an encrypted environment. Tresorit’s core strength is in safeguarding confidential data through client-side encryption, ensuring that only users have access to their data, a key feature that sets it apart from traditional cloud storage providers.
Tresorit was established by Istvan Lam, Szilveszter Szebeni, and Gyorgy Szilagyi with the mission to provide a secure alternative to mainstream cloud storage options. It officially launched its encrypted cloud storage service after a stealth beta phase in April 2014. The company has expanded its operations with offices in Zurich, Munich, and Budapest, employing about 100 to 156 people as of recent data. Its user base has steadily grown, having served over 17,000 customers with revenues estimated around $24.9 million in 2025. It has also been recognized as one of the fastest-growing cybersecurity companies in Europe, featured in the Financial Times FT1000 list.
End-to-end encrypted cloud storage and file synchronization.
Secure file sharing with granular access controls
Encrypted email attachments and secure email encryption add-ons.
eSignature functionality integrated for digital document workflow management.
Data room collaboration that allows project management within encrypted and branded spaces.
Tresorit has raised approximately $18.01 million over six funding rounds. Its latest funding event in July 2021 was a corporate majority acquisition by Swiss Post Communications Services, which became the sole shareholder. This acquisition was intended to boost Tresorit’s expansion, especially in German-speaking markets such as Germany, Austria, and Switzerland. The company reported significant revenue growth and a robust recurring revenue base with rapid scaling in recent years.
Notable recent updates include enhanced file and folder management such as restoring deleted files and renaming/moving folders within encrypted storage, improvements in UI for easier navigation, credit card expiration notifications, and updated autocomplete behaviors in search. These improvements reflect the company's ongoing commitment to usability while maintaining security.
Tresorit’s culture is rooted in strong commitment to privacy, security, and trust. It emphasizes protecting sensitive information and providing customers with confidence in managing confidential data. The company values customer trust and transparency, offering solutions that are designed to meet high standards of cybersecurity while remaining user-friendly. Its engagement with cybersecurity firms and responsiveness to privacy concerns highlights its dedication to the security-first philosophy
Tresorit’s customer base includes over 17,000 clients worldwide, spanning industries with high security needs such as finance, legal, healthcare, and public institutions. The community values Tresorit’s reliability and ease of use in secure file storage, often contrasting it with less secure but popular cloud services. Reviewers and users consistently praise its encryption standards, access control, and seamless integration into workflows, making it a trusted choice for sensitive data management.
