WeTransfer and data security: what you need to know before sending your files in 2026
WeTransfer is one of the most popular file transfer services in the world. Its strength lies in simplicity: drag your files, enter an email address, and it's sent. But that simplicity masks significant security gaps that most users overlook. Before sending sensitive documents through WeTransfer, here's what you should know about encryption, data storage, GDPR compliance, and past security incidents.
How does WeTransfer encrypt your files?
WeTransfer uses two layers of encryption:
- In transit (TLS): your files are encrypted during transfer between your browser and WeTransfer's servers using TLS (Transport Layer Security). This prevents data interception during upload and download
- At rest (AES-256): once stored on their servers, your files are encrypted with AES-256, a military-grade standard widely used across the industry
However, there's a crucial catch: WeTransfer does not offer end-to-end encryption (E2E). This means WeTransfer holds the encryption keys to your files. In theory, the company can access the contents of every transfer. With true end-to-end encryption, only the sender and recipient hold the keys -- the provider cannot read the files, even if it wanted to.
For a detailed breakdown of the difference between these approaches, see our complete guide to end-to-end encryption.
Where are your files stored?
WeTransfer is headquartered in Amsterdam, the Netherlands. However, its storage servers are spread across both the European Union and the United States. This dual location has significant legal implications:
- European servers: data stored in Europe is protected by the GDPR, which enforces strict standards for personal data protection
- US servers: data stored in the United States is potentially subject to American surveillance laws (CLOUD Act, FISA Section 702), which allow government agencies to access data held by companies operating on US soil
As a user, you have no choice over which servers your files are stored on. A transfer initiated from Europe could easily end up on a US server.
WeTransfer's GDPR compliance
WeTransfer states that it complies with the GDPR and the Dutch UAVG (the national implementation of the GDPR). The company holds ISO/IEC 27001 certification, meaning it follows internationally recognised best practices for information security management.
However, WeTransfer's GDPR compliance has been questioned on several occasions:
- Storing data on US servers raises concerns about compliance with the Schrems II rulings, which invalidated the Privacy Shield and tightened the conditions for transferring data to the United States
- WeTransfer collects technical data about its users' devices: device model, operating system, IP address, system language, and device identifier, to determine approximate geolocation
WeTransfer security incidents
WeTransfer has experienced notable security incidents:
The June 2019 incident: files sent to the wrong recipients
In June 2019, WeTransfer accidentally sent thousands of files to the wrong email addresses over a two-day period. Sensitive files ended up with unintended recipients. This wasn't a hack but an internal malfunction, which in some ways is even more concerning: it shows that even without an external attack, your files can be exposed by a system error.
The terms of service controversy
WeTransfer faced criticism after updating its terms of service, whose vague language raised concerns about how user files and data might be used. Some critics interpreted the new terms as granting the company broad enough rights to train AI models on user files. This controversy highlights a structural problem: when a provider holds the encryption keys, the terms of service become the only safeguard.
Security limitations of the free plan
WeTransfer's free plan has specific weaknesses:
- No password protection: anyone with the download link can access your files
- Shareable link: the download link can be forwarded to others without your consent
- 7-day expiration: files are deleted after 7 days, but during that window they are accessible without any controls
- No download tracking: you don't know who downloaded your files or how many times
The paid plan (WeTransfer Pro) adds password protection and access controls, but the fundamental issue remains: no end-to-end encryption.
When is WeTransfer acceptable and when isn't it?
WeTransfer is fine for:
- Sending non-sensitive files (holiday photos, non-confidential creative assets, public documents)
- One-off transfers where the risk of exposure is acceptable
WeTransfer is not suitable for:
- Personal or health data (medical records, client information, HR data)
- Legal or financial documents (contracts, balance sheets, banking information)
- Files subject to regulatory requirements (GDPR, HIPAA, professional secrecy)
- Transfers where confidentiality is critical (intellectual property, trade secrets)
For a detailed look at the alternatives, see our WeTransfer security comparison with alternatives and our guide to WeTransfer alternatives in 2026.
Alternatives with end-to-end encryption
If file security is a priority, choose services that offer true end-to-end encryption, where only the sender and recipient can decrypt the files. Key criteria to look for:
- Verifiable E2E encryption: the provider must not have access to decryption keys
- European hosting: to avoid risks associated with US surveillance laws
- Zero-knowledge policy: the provider cannot read your files, even under legal compulsion
- Auditable source code: security should rely on transparency, not blind trust
ZeroTrustTransfer was built to meet these requirements: true end-to-end encryption, hosting in France, and a zero-knowledge policy. The provider cannot access your files -- the decryption keys remain exclusively between the sender and the recipient.
FAQ
Can WeTransfer read my files?
Technically, yes. WeTransfer encrypts your files at rest with AES-256, but the company holds the encryption keys. This means it can technically access the contents of your transfers. WeTransfer says it does not read its users' files, but that assurance rests on trust and terms of service, not on technical impossibility. With end-to-end encryption, the question doesn't even arise: the provider doesn't possess the keys and cannot decrypt the files, even if it wanted to.
Is WeTransfer GDPR-compliant for sending personal data?
WeTransfer is ISO 27001 certified and claims GDPR compliance. However, storing data on US servers raises compliance questions, particularly since the Schrems II rulings. If you're sending personal data (client information, HR records, medical files), you need to assess whether the level of protection WeTransfer offers is sufficient given your regulatory obligations. For sensitive data, a service with end-to-end encryption and exclusively European hosting is a safer choice.
Could the 2019 incident happen again?
The June 2019 incident, where files were sent to the wrong email addresses, was caused by an internal malfunction, not a hack. WeTransfer fixed the issue and strengthened its processes. However, no system is immune to software bugs or human error. This is precisely why end-to-end encryption matters: even if a file is sent to the wrong recipient, it remains unreadable without the decryption key. That safety net doesn't exist with WeTransfer.