AES-256 Encrypt & Decrypt

🔐 Encrypt and decrypt text with AES-256 — the world's most trusted encryption standard. 100% browser-based, zero server contact, Web Crypto API powered.

✅ 100% Free🔒 Never Sent to Server⚡ Web Crypto API🛡️ AES-128 / 192 / 256

PBKDF2 Key Derivation

Random IV + Salt

AES-CBC Mode

100% Client-Side Processing

All encryption and decryption runs in your browser using the native Web Crypto API. Your data and password never leave your device.

AES Key Size

🛡️ Recommended — highest security

Output Format

Compact, URL-safe — ideal for web/API use

Encryption Password*

Plaintext Input

0 chars

Encrypted Output

0 chars

🔧 How It Works

Military-grade AES encryption running entirely in your browser

Enter Text & Password

Type your plaintext and a strong password. Choose AES key size (128, 192 or 256-bit) and output format

Encrypt or Decrypt

Click Encrypt to secure your data or Decrypt to recover it. All processing happens in your browser using the Web Crypto API

Copy or Download

Copy the encrypted output or download it as a file. Share the password securely to allow decryption

Frequently Asked Questions

Everything you need to know about AES-256 encryption

Do I need to sign up or log in to use this tool?

No. All QuickTextTools are completely free to use online with no login, signup, or account required.

What is AES-256 encryption?

AES (Advanced Encryption Standard) is the most widely used symmetric encryption algorithm in the world. AES-256 uses a 256-bit key and is considered military-grade encryption. It is used by governments, banks, and security professionals worldwide to protect sensitive data.

Is my data safe when using this tool?

Yes. All encryption and decryption happens entirely in your browser using the Web Crypto API — a native browser security API. Your text and password are never sent to any server, stored, or logged anywhere.

What is the difference between AES-128, AES-192 and AES-256?

The numbers refer to the key length in bits. AES-128 uses a 128-bit key (16 bytes), AES-192 uses 192 bits (24 bytes), and AES-256 uses 256 bits (32 bytes). Longer keys provide stronger security. AES-256 is recommended for the highest level of protection.

What is IV and Salt in AES encryption?

IV (Initialization Vector) is a random value used to ensure that the same plaintext encrypted with the same key produces different ciphertext each time. Salt is a random value used in key derivation (PBKDF2) to prevent dictionary and rainbow table attacks. Both are automatically generated and embedded in the output.

What is the difference between Base64 and Hex output?

Both are text representations of the encrypted binary data. Base64 produces shorter output using 64 printable characters and is commonly used in web and API contexts. Hex produces longer output using only 0-9 and A-F characters and is preferred in debugging and low-level programming.

How do I decrypt the output?

Switch to Decrypt mode, paste the encrypted ciphertext (Base64 or Hex), enter the same password and key size used during encryption, select the same output format, and click Decrypt. The IV and Salt are automatically extracted from the ciphertext.

Can I decrypt on a different device or browser?

Yes. The encryption output contains all the information needed for decryption (IV and Salt are embedded). As long as you use the same password and key size, you can decrypt on any device or browser that supports the Web Crypto API — which includes all modern browsers.