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100% private — All encryption runs in your browser. Your text and keys never leave your device.
Developer Tool

Crypto Encrypt/Decrypt

Free online AES encryption and decryption tool. Securely encrypt and decrypt your data in the browser.

🔐
AES-CBC Mode
Cipher Block Chaining with PKCS7 padding via CryptoJS
🔑
Key-based Security
16/24/32 char keys for AES-128, 192, or 256-bit strength
📦
Base64 Output
Encrypted output is Base64 encoded — safe for storage and transfer
🔒
Encrypt
Plain text → AES ciphertext
Encrypted result will appear here automatically...
🔓
Decrypt
AES ciphertext → plain text
Decrypted result will appear here automatically...

What is AES Encryption?

AES (Advanced Encryption Standard) is the most widely used symmetric encryption algorithm in the world. It operates on fixed-size blocks of data using a secret key to transform plain text into an unreadable ciphertext. Only someone with the correct key can reverse this process.

How does this tool work?

This tool uses the CryptoJS library to perform AES encryption and decryption entirely in your browser. No data is transmitted to any server. The encryption uses CBC (Cipher Block Chaining) mode with PKCS7 padding, and outputs a Base64-encoded string safe for storage or transmission.

When should you use AES encryption?

AES encryption is ideal for securing sensitive data like API tokens, configuration values, personal information, or any string you want to store or transmit securely. It is not suitable for password storage — use bcrypt or Argon2 for that.

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Frequently Asked Questions

Everything you need to know about using the Crypto Encrypt/Decrypt tool.

AES (Advanced Encryption Standard) is a symmetric encryption algorithm widely used to secure data. It encrypts and decrypts data using the same secret key, making it fast and highly secure.