CryptAge

CryptAge is a native Android app for encrypting and decrypting files and folders with the age file encryption format, built on kage, with Zstandard folder archiving and a Material You (Material 3) interface.

Features Encrypt and decrypt files with age: key-based (recipients/identities) and passphrase-based (scrypt) modes; decrypt auto-detects the mode from the age header. Streaming end to end: arbitrarily large files without loading them into memory. Batch processing with per-file progress and per-file error isolation. Folder encryption: tar + zstd archive, then age-encrypt; decryption reverses it. Zstd parameters adjustable in Settings. Named key management: generate keypairs, import secret/public keys, encrypt to multiple recipients. Secret keys stored encrypted at rest (Android Keystore-backed). Optional app lock with biometrics and/or PIN. Output saved where you choose via the Storage Access Framework; .age naming handled automatically. Material You dynamic color following the system light/dark setting, themed-icon support. English UI, fully resource-based and ready for additional languages.