Tresorit

File security without compromise: end-to-end encrypted storage, sharing and collaboration aimed at businesses and privacy-maximalist individuals. Its natural home is regulated work — law firms, healthcare and finance teams lean on it for compliance-grade controls layered on top of the encryption: granular access policies, expiring share links, detailed audit trails and remote wipe. Everyday users get the same zero-knowledge protection in a more polished package than most. In short, it's for people and organisations whose files carry real confidentiality or regulatory weight.

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About as trustworthy as this market gets. It's a Swiss company founded in 2011, and since 2021 it has been majority-owned by Swiss Post — Switzerland's national postal service — which is an unusually conservative kind of owner. It's ISO 27001-certified, independently audited, and zero-knowledge encrypted throughout, so Tresorit itself cannot read your files. Institutional, compliance-grade trust is essentially its entire product, which is why it's our most-secure pick even though it costs more than the consumer-focused rivals.

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Not really any more. Tresorit no longer offers a standing free storage tier — what's available now is a time-limited free trial to evaluate the service, after which it's a paid, business-grade product. That's deliberate: it's built and priced as a premium, compliance-focused service rather than a freemium one. If you specifically want capable free encrypted storage, MEGA (with its large free allowance) or Proton Drive (up to 5 GB) are far better suited to that.

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Swiss Post — Switzerland's national postal service — holds the majority stake, acquired in 2021, while the original Hungarian-Swiss founding team continues to run the product day to day. State-postal ownership combined with Swiss privacy law gives Tresorit an unusually conservative, stable trust profile that few competitors in this market can match.

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It comes down to who holds the keys. Dropbox encrypts your files but can technically access them — it keeps the keys — which is precisely what powers its huge ecosystem of integrations and easy collaboration. Tresorit is zero-knowledge: only you hold the keys, so it structurally cannot read your data, which rules out an entire class of risk but also some conveniences. Put another way, Dropbox optimises for collaboration breadth and third-party apps; Tresorit optimises for confidentiality and compliance. Choose Dropbox for frictionless teamwork, Tresorit for files that must stay genuinely private.

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