AES Encrypt/Decrypt Online - EXUtil Extended Utilities

Free online AES symmetric encryption and decryption tool. Supports ECB/CBC/CFB/OFB/CTR modes with configurable padding and Base64/Hex output formats.

How to use

  1. Paste or import the content you want to process.
  2. Choose an available action and run the tool.
  3. Review the result, then copy or download the output.

Frequently asked questions

AES modes?
ECB, CBC, CFB, OFB, CTR. CBC most common, CTR supports parallel encryption.
Same key for encrypt/decrypt?
Yes. AES is symmetric. Keep key secure - if leaked, data is compromised.
AES-128 vs AES-256?
AES-256 more secure but slower. AES-128 is secure; AES-256 for highest security.
What is IV?
Initialization Vector - random value ensuring same plaintext encrypts differently. Must be random and unique.
AES for passwords?
No. AES is reversible. If key leaks, all passwords leak. Use Bcrypt for passwords.

References

Technical standards and official documentation related to this tool.