OpaqueFiles is a free and open-source project that can be used to encrypt data before uploading it to cloud providers or local storage.

Please also check out Cryptomator to see what suits you best.

Features

• Encryption: ChaCha20-Poly1305 (default), AES-GCM-SIV
• Remember password: Password can be saved in ~/.config/OpaqueFiles/opaqueFiles.properties to avoid typing
• Compression: None, Zstd (default), gzip, XZ
• Reed–Solomon Error Correction
• Argon2id key derivation
• Verification: Checks your encrypted files for errors during encryption
• Checking: Check your encrypted files for malicious manipulation
• Scrubbing: Check your encrypted files for corruption, and fix the corruption
• UNIX Pipes
• Stress testing: Test CPU/Memory stabilty. Faster but not as reliable as Memtest