AES Encryption

Encrypt and decrypt text with AES-GCM
This free online aes encryption runs in your browser and is part of our Cryptography collection.

🔒 AES Encryption

Encrypt and decrypt text using AES-GCM (Advanced Encryption Standard - Galois/Counter Mode)

About AES-GCM Encryption:

  • Algorithm: AES-GCM provides both encryption and authentication
  • Key Size: 128-bit or 256-bit keys (256-bit recommended for higher security)
  • IV (Initialization Vector): Randomly generated for each encryption, included in output
  • Format: Output format is iv:ciphertext (both in hex)
  • Security: Keep your encryption key secret and secure
  • Use Cases: Secure data storage, message encryption, file encryption

⚠️ Important Security Notes:

  • Never reuse the same IV (Initialization Vector) with the same key
  • Store your encryption key securely - if lost, data cannot be recovered
  • For production use, consider using a key management system
  • This is for educational/testing purposes only
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Instant In-Browser Execution Runs locally in JavaScript without wait times or server delays.
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100% Privacy & Security Your inputs and files are never stored or logged on remote servers.
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Cross-Device Responsive Fully optimized for mobile smartphones, tablets, and desktop displays.
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100% Free Forever No subscription fees, no signups, and no software installations.

How to Use the Online AES Encryption

1 Choose Mode (Encrypt or Decrypt)

Select "Encrypt" to protect plaintext, or "Decrypt" to restore ciphertext using your secret key.

2 Enter Message & Passphrase

Type your sensitive text and enter a strong secret password or 256-bit hexadecimal key.

3 Select Cipher Mode (AES-GCM)

Use authenticated AES-GCM (Galois/Counter Mode) with automatic 96-bit initialization vector (IV) generation.

4 Execute & Copy Output

Click "Encrypt" or "Decrypt" to run authenticated encryption in client-side Web Crypto and copy the Base64 ciphertext package.

Frequently Asked Questions

Common questions about using this free online aes encryption.

Why is AES-GCM superior to AES-CBC? ▾
AES-GCM is an Authenticated Encryption with Associated Data (AEAD) mode. In addition to encrypting data, it generates a cryptographic authentication tag that guarantees the ciphertext has not been tampered with or modified.
What is an Initialization Vector (IV) and why is it needed? ▾
An IV ensures that encrypting identical plaintexts with the same key produces completely different ciphertexts every time. In AES-GCM, the IV does not need to be kept secret and is safely stored alongside the ciphertext.
Can you recover my data if I forget my password? ▾
No. AES-256 is an unbroken military-grade symmetric cipher with 2^256 possible key combinations. Without the exact passphrase or key, decryption is mathematically impossible.
Does this tool transmit my plaintext or key to a server? ▾
Never. Encryption and decryption occur entirely within your browser via the `SubtleCrypto` interface. Data never touches any server.

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