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AES-256 Encrypt & Decrypt

Encrypt and decrypt text using AES-256. Your passphrase and data never leave the browser.

Plaintext

Passphrase

Output Format

Encrypted Output

Click "Encrypt" to generate ciphertext...

About AES-256 Encrypt & Decrypt

Security-sensitive operations should never require uploading your data to a third-party server. AES-256 Encrypt & Decrypt runs entirely in your browser, letting you encrypt and decrypt text using aes-256. your passphrase and data never leave the browser with complete confidence that your information stays private. No server calls, no logging, no data retention.

How to Use

Enter your data Paste or type your sensitive data into the input field. Remember: nothing leaves your browser.

Configure options Select the algorithm, encoding format, key size, or other parameters as needed.

Process Click the action button to encrypt, hash, encode, or perform the security operation.

Copy the output Copy the result securely. For sensitive outputs, make sure to store them in a safe location.

🔒 Privacy note: All processing happens locally in your browser. Your data is never sent to any server.

Why Use AES-256 Encrypt & Decrypt?

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True Client-Side Security All cryptographic operations run in your browser using the Web Crypto API. Your sensitive data — passwords, keys, encrypted messages — never touches any server.

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Industry-Standard Algorithms AES-256 Encrypt & Decrypt uses the same cryptographic algorithms trusted by banks, governments, and security professionals worldwide. No homebrew crypto.

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Open & Transparent View the source code right in your browser (Ctrl+U). Verify exactly what the tool does with your data — no hidden behavior, no tracking.

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No Registration Required Security tools should be accessible without creating accounts or sharing personal information. Use AES-256 Encrypt & Decrypt immediately — no sign-up, no email, no strings attached.

Frequently Asked Questions

AES-256 is the gold standard for symmetric encryption, used by governments and militaries worldwide. It has no known practical attacks — brute-forcing 256-bit keys is computationally infeasible. The passphrase strength is the main security factor.

The passphrase is run through PBKDF2 (or similar KDF) to derive a 256-bit key. CryptoJS uses OpenSSL-compatible key derivation. The same passphrase always produces the same key, which is why sharing the passphrase securely is critical.

This tool uses CryptoJS which implements AES in CBC mode with PKCS7 padding and OpenSSL-compatible key derivation (MD5-based EVP_BytesToKey). For production cryptography, consider using the Web Crypto API with AES-GCM which provides authenticated encryption.