Crypto String - AES Encrypt

Military-grade AES-256-GCM encryption + Base64. 100% offline, zero data collection, file import & key management. Secure your text instantly — completely free!

Crypto String is the ultimate secure text encryption app using military-grade AES-256-GCM with authentication. Protect your sensitive information with powerful encryption and Base64 encoding — all 100% offline and private.

Core Features • AES-256-GCM Encryption – Military-grade algorithm with custom keys for unique results • Base64 Encode/Decode – Fast and reliable for data transmission and storage • File Import – Directly import text/keys from local files or iCloud Drive • Smart Key Management – Import keys + eye-icon toggle to view/hide safely • History Records – Auto-save last 10 operations with key hints (only first 4 chars) • Bilingual Interface – Full English & Simplified Chinese support • Dark Mode + iOS Native – Built with Apple CryptoKit for maximum security

Security First • 100% Local Processing – Nothing uploaded to cloud • No data collection, no accounts, no tracking • Keys never stored in plain text • One-time purchase, no ads, no subscriptions

Perfect for protecting passwords, notes, private messages, or business data. Simple, fast, and truly private.

Download Crypto String now and encrypt with confidence!