Hashers Hash

AES Encryption & Decryption Online Tool

Secure AES Encrypt and Decrypt Text Instantly

HashersHash provides a free online AES encryption and decryption tool that lets you securely encrypt and decrypt text using the Advanced Encryption Standard (AES). This tool supports popular AES modes like CBC, ECB, CFB, OFB, and CTR, along with standard padding schemes such as PKCS7.

You can use this tool to:

  1. Encrypt sensitive data
  2. Decrypt AES ciphertext
  3. Validate AES implementations
  4. Test AES encryption across different modes and paddings

All encryption and decryption happen locally in your browser, ensuring your data is never sent to a server.

AES Encryption

Encrypted AES Result:

Encrypted AES results displays here..

AES Decryption

Decrypted AES Result:

Decrypted AES results displays here..

Supported AES Modes

Our AES tool supports the following encryption modes:

  1. AES-CBC (Cipher Block Chaining) - Recommended for general encryption
  2. AES-ECB (Electronic Codebook) - For educational and legacy use (not recommended for security)
  3. AES-CFB (Cipher Feedback)
  4. AES-OFB (Output Feedback)
  5. AES-CTR (Counter Mode)

Security Tip: AES-ECB does not use an initialization vector (IV) and is not secure for sensitive data.


Supported Padding Schemes

  1. PKCS7 (Recommended)
  2. ANSI X.923
  3. ISO 10126
  4. Zero Padding
  5. No Padding (advanced users only)

Using an incorrect padding scheme may result in decryption errors or malformed output.


How to Use the AES Tool

AES Encryption

  1. Enter your plaintext
  2. Choose AES mode and padding
  3. Provide a secret key
  4. (Optional) Enter or auto-generate an IV
  5. Click Encrypt to generate ciphertext (Base64 or Hex)

AES Decryption

  1. Paste the AES ciphertext
  2. Select the same mode, padding, and key used for encryption
  3. Provide the original IV (if applicable)
  4. Click Decrypt to recover the original text

Privacy & Security

  1. Runs completely client-side
  2. No data storage
  3. No network calls
  4. Open and transparent encryption logic

Your keys and messages remain private and secure.



Frequently Asked Questions (FAQ)

What is AES encryption?

AES (Advanced Encryption Standard) is a symmetric encryption algorithm widely used to protect sensitive data.

Which AES mode should I use?

For most use cases, AES-CBC with PKCS7 padding is recommended. Avoid ECB for real security needs.

Why do I get "Malformed UTF-8 data"?

This usually happens due to:

  • Incorrect key or IV
  • Mismatched mode or padding
  • Using NoPadding with non-UTF-8 data

Why Use HashersHash AES Tool?

  • Free and fast
  • Multiple AES modes supported
  • Browser-based encryption
  • Ideal for developers, testers, and learners
  • No signup required