AES Encryption and Decryption Tool – Online AES Testing (ECB, CBC, CTR)

AES (Advanced Encryption Standard) is the most widely used symmetric key encryption algorithm in modern applications.
This page provides an online AES encryption/decryption tool built directly into WordPress using PHP OpenSSL.
You can test various AES configurations such as mode, padding, key size, IV, and output format, similar to popular online tools like Devglan.

⭐ Features

This tool allows you to test AES encryption and decryption with the following options:

1. Operation

Encrypt – Convert plain text into ciphertext
Decrypt – Convert ciphertext back into plain text

2. Cipher Mode

ECB
Does not use an IV
Fast but not recommended for real security due to pattern leaks
CBC
Most commonly used mode, requires a 16-byte IV
CTR
Stream-like operation, efficient and secure when IV/nonce is used properly

3. Padding

PKCS5Padding
Standard padding used in most AES implementations
NoPadding
Only works when data length is exactly a multiple of 16 bytes

4. Key Size

128-bit (16 bytes)
192-bit (24 bytes)
256-bit (32 bytes)
Strings are padded or trimmed automatically to match the selected key size.

5. IV (Initialization Vector)

Required for CBC and CTR modes
Not used in ECB
If left empty, a zero-filled IV will be used (for testing only)

6. Output Format

Base64 – Recommended for easy sharing of ciphertext
Hex – Useful for debugging or compatibility with other systems

🔧 AES Encryption/Decryption Test Form

Enter your values below and click Run to perform encryption or decryption.
This tool is for testing and educational purposes.

AES Encryption / Decryption Tool

Action
Encrypt Decrypt

Cipher Mode

Padding

Key Size

Output Format

Key
Key is automatically trimmed or padded to match the selected key size.

IV (Initialization Vector)
Used for CBC and CTR modes. If empty, a zero-filled IV will be used.

Text
Enter plain text for encryption, or ciphertext for decryption.

🧪 Matching Results with Other Languages

This AES tool uses:

Algorithm: AES
Modes: ECB / CBC / CTR
Padding: PKCS5Padding or NoPadding
Key sizes: 128 / 192 / 256 bits
Output format: Base64 or Hex

To match the output in other languages, ensure the following are identical:

Key size
Mode (AES/CBC, AES/CTR, AES/ECB)
IV value
Padding scheme
Input/output format

Languages commonly used in AES testing:

Python (PyCryptodome)
Java (javax.crypto)
JavaScript (CryptoJS, WebCrypto)
PHP OpenSSL
C#, Node.js, Go, etc.

⚠️ Disclaimer

This tool is intended for testing and educational purposes only.
Do not use it to encrypt sensitive or production-level data.