Encrypt Your Cloud Storage
Keep your files private, even from your cloud provider. CryFS encrypts everything locally before it ever leaves your computer.
Works seamlessly with
How CryFS Works
Simple setup, powerful protection. Your files are encrypted before they ever leave your computer.
Create Your Files
Work with your files normally in your encrypted folder. Documents, photos, anything you want to protect.
CryFS Encrypts
CryFS automatically encrypts your files locally, including all metadata and folder structure.
Sync Securely
Only encrypted data syncs to the cloud. Your provider sees nothing but encrypted blocks.
Why Choose CryFS
Purpose-built for cloud storage encryption with security features other tools lack.
Complete Encryption
File contents, metadata, filenames, and folder structure are all encrypted. Nothing readable leaves your device.
Hidden Directory Structure
Unlike other tools, CryFS hides your folder hierarchy. Attackers cannot see how your files are organized.
Block-Based Storage
Files are split into encrypted blocks, hiding file sizes. Large files sync efficiently with incremental updates.
Authenticated Encryption
Using AES-256-GCM, your data is protected from tampering. Any unauthorized changes are detected immediately.
High Performance
Optimized for speed with minimal overhead. Work with your encrypted files as smoothly as regular files.
Open Source
Fully open source under LGPL. Review the code, verify the security, and contribute improvements on GitHub.
Built for Security, Not Just Privacy
CryFS was developed as part of a Master's thesis in computer science, with formal security proofs. It's not just another encryption tool — it's designed from the ground up to protect your data against real-world threats.
- Formally verified security with published proofs
- AES-256-GCM authenticated encryption
- Zero-knowledge architecture
- No data leaves your device unencrypted
- Open source for full transparency
- Regular security audits and updates
Ready to Secure Your Files?
Download CryFS today and take control of your cloud storage privacy. Free, open source, and trusted by privacy-conscious users worldwide.
Contact Us
We'd love to hear from you. Questions, feedback, or ideas are all welcome.