Filen

Filen is a German end-to-end encrypted cloud storage service built around zero-knowledge AES 256-bit client-side encryption and multi-device sync. Files, notes, and chats are encrypted on the user's device before they ever reach the server, so no one, not even Filen staff, can read the content, giving individuals and businesses a privacy-first alternative to mainstream US cloud storage.

The product spans web, desktop, mobile, and CLI apps with five sync modes, network-drive mounting, Smart Sync for on-demand files, and built-in encrypted notes and chat for secure collaboration. Developers get SDKs, WebDAV, and S3-compatible endpoints, while all Filen apps are open source so any claim about the encryption can be independently audited.

Key benefits:

• Zero-knowledge encryption with AES-256 performed on the client device
• Multi-device sync offering five sync modes across desktop and mobile
• Network drive mounting with Smart Sync for on-demand files
• Encrypted notes and chat for privacy-preserving team collaboration
• Open-source apps fully auditable on web, desktop, mobile, and CLI
• Developer APIs including SDKs, WebDAV, and S3-compatible endpoints

Filen is entirely developed, operated, and hosted in Germany, adhering to German data protection law and the GDPR. Customer data never leaves European jurisdiction, and the zero-knowledge architecture means encryption keys stay on the user's device, making Filen a sovereign alternative to US cloud drives exposed to the CLOUD Act.

Ideal for privacy-focused individuals, journalists, legal and medical professionals, and European businesses that need verifiable confidentiality rather than a marketing claim.