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AES Encryption - Free Online AES Encrypt Decrypt Tool
Encrypt and decrypt data using AES symmetric encryption with this free online tool. Supports AES 256 and AES 128 with multiple modes including CBC ECB CTR. Generate random keys and IV for each operation. Fast accurate browser-based AES encryption tool with complete privacy.
How to Use AES Encryption Tool
Quick Start Guide
1
Enter your text and encryption key (32 chars for AES-256).
2
Select encryption mode (CBC recommended) and padding method.
3
Click 'Encrypt' to encrypt or 'Decrypt' to decrypt.
4
Copy the result or generate random key/IV if needed.
💡Pro Tips
✓Always use CBC or CTR mode instead of ECB for better security
✓Keep your encryption key secure and never share it
✓Use different IVs for each encryption operation in CBC mode
✓AES-256 provides stronger security than AES-128 but is slightly slower
Frequently Asked Questions
AES (Advanced Encryption Standard) is a symmetric encryption algorithm widely used worldwide. It encrypts data in fixed blocks of 128 bits using keys of 128, 192, or 256 bits. AES is fast, secure, and approved by the U.S. government for classified information.
AES-128 uses a 128-bit key and performs 10 rounds of encryption, while AES-256 uses a 256-bit key and performs 14 rounds. AES-256 provides stronger security but is slightly slower. For most applications, AES-128 is sufficient.
ECB (Electronic Codebook) is the simplest but least secure mode. CBC (Cipher Block Chaining) chains blocks together and requires an IV, making it more secure. CTR (Counter) turns block cipher into stream cipher, allowing parallel processing. CBC is recommended for most use cases.
Yes, AES is considered highly secure when properly implemented. It's used by governments, banks, and tech companies worldwide. No practical attacks against full AES have been discovered. The main vulnerability is poor key management, not the algorithm itself.
AES cannot be practically cracked with current technology. Brute-forcing AES-256 would take billions of years with today's computers. However, poor implementation (weak keys, reused IVs) can compromise security.
AES is symmetric encryption (same key for encryption and decryption) and is very fast, making it ideal for large data. RSA is asymmetric encryption (different public/private keys) and is slower, making it suitable for key exchange and small data. They're often used together in hybrid systems.
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