AES Encryptor

What is AES Encryptor?

AES Encryptor performs symmetric encryption and decryption using AES-256-GCM (Galois/Counter Mode) via the Web Crypto API directly in the browser. It generates a random 96-bit initialization vector (IV) for each encryption, ensures authenticated encryption that detects any tampering with the ciphertext, and outputs results in Base64 or hexadecimal format. All cryptographic operations happen client-side with no data transmission.

Security engineers testing encryption implementations, developers learning cryptographic concepts, and privacy-conscious users encrypting sensitive text. The tool runs entirely in your browser — your data never leaves your device.

How to Use AES Encryptor

1. Enter the plaintext message you want to encrypt in the input field
2. Provide or generate an encryption key — the tool supports 256-bit keys
3. Click Encrypt to generate the ciphertext with an auto-generated IV
4. To decrypt, paste the ciphertext, provide the same key and IV, and click Decrypt
5. Copy the encrypted output in Base64 or hex format for storage or transmission

Common Use Cases

• Encrypting sensitive configuration values before storing them in environment files
• Protecting personal notes or passwords with a known secret key
• Testing AES encryption and decryption logic to verify application implementations
• Encrypting data before pasting it into shared documents or communication channels
• Learning symmetric encryption concepts by experimenting with different keys and plaintext

Pro Tips

• Never reuse an IV with the same key — AES-GCM becomes completely insecure if an IV is repeated, which is why this tool generates a fresh random IV for every encryption
• GCM mode provides authenticated encryption — if the ciphertext is modified even slightly, decryption will fail with an authentication error rather than silently producing corrupt plaintext
• Store the IV alongside the ciphertext (it is not secret) — you need it for decryption, and it is safe to transmit in the clear

Why Use This Tool?

• Privacy-first: All processing happens locally in your browser. No data is transmitted to any server.
• No installation required: Works in any modern browser on desktop or mobile.
• Completely free: No account, no credit card, no usage caps.
• Fast and reliable: Powered by modern Web APIs for near-instant results.

Related Concepts

Learn more about related topics: AES-256-GCM, Initialization vector, Authenticated encryption, Web Crypto API.

Frequently Asked Questions