TL;DR:
- End‑to‑end client‑side encryption: no provider access to your data (Tresorit KB, 2024).
- Free: up to 5Â GB, 100 files, 7 days or 10 downloads, optional password and instant revocation (Tresorit KB, 2024).
- WeTransfer: no end‑to‑end encryption and loss of trust after a controversial AI clause (TechRadar, 2025).
- Proton Drive and pCloud offer more space but lack the robustness of a single‑use link (TechCrunch, 2024).
- Nextcloud File Drop: sovereign self‑hosted solution ideal for SMEs (Nextcloud Blog, 2023).
1. Tresorit Send: the detailed principle
Tresorit Send stands out for solid end‑to‑end encryption (E2EE): your files are encrypted client‑side and only you hold the keys. Each transfer generates a unique sharing link and you can add a password and expiry. The storage is in Switzerland, subject to strict privacy laws, and Tresorit is ISO 27001/SOC 2 certified.
2. Practical limitations and usage tips
- Size: Up to 5Â GB per transfer and 100 files max.
- Duration: Links valid for 7 days or 10 downloads, with automatic deletion after expiry.
- Traceability: Email notification for each download, ideal for effective traceability.
Blue Fox tip: when creating the sharing link, be sure to note down the URL returned by the system – it is not stored anywhere else! Without it, you won’t be able to retrieve it later.
3. WeTransfer: Chronicle of broken trust
On 8 July 2025, WeTransfer angered its users by including a clause allowing transmitted files to be used to train artificial intelligence models (TechRadar, 2025). The immediate outcry, especially among creative and legal professionals, forced the platform to withdraw the clause on 15 July 2025 and issue a public apology (BBC, 2025, ExpressVPN, 2025). Despite this climbdown, trust has been durably eroded: WeTransfer does not offer end‑to‑end encryption, leaving a major server-side vulnerability.
4. Technical comparison of alternatives
A word from Blue Fox
The recent WeTransfer controversy shows that ease of use should never compromise your security or legal compliance, especially in the face of ever-changing regulatory requirements. Tresorit Send deftly combines simplicity and security with its robust encryption, and when paired with an in-house cloud such as Nextcloud you get a sovereign solution at no extra cost for your sensitive exchanges.
At Blue Fox, we are here to support you in implementing an optimal strategy and to train your teams effectively.
Verified sources:
- TechRadar (16 July 2025) – AI context and retraction
- BBC/The Guardian (16 July 2025) – clarifications
- ExpressVPN (13 July 2025) – security analysis of WeTransfer
- Tresorit Support – presentation & limits of Tresorit Send
- Tresorit Support – FAQ on Tresorit Send limits
- Nextcloud – File Drop E2EE with Hub 4
- TechCrunch – Proton Docs in Proton Drive
- Tresorit Blog – introduction to Tresorit Engage