About the Online AES Encrypt and Decrypt Tool
The Online AES Encrypt and Decrypt Tool helps you encrypt plain text and decrypt AES ciphertext online. AES, short for Advanced Encryption Standard, is a symmetric encryption algorithm that uses the same secret key for encryption and decryption. AES is not a hash function and does not create checksums.
This page is designed for AES text encryption and AES text decryption. It is useful for testing sample text, learning how AES works, and comparing encryption settings during development. Do not enter real passwords, private keys, API secrets, production keys, or other sensitive data into any online tool.
• AES Principles
AES converts readable plaintext into ciphertext with a secret key, then converts the ciphertext back to plaintext when the correct key and matching settings are provided. Common AES key lengths include 128-bit, 192-bit, and 256-bit, often referred to as AES-128, AES-192, and AES-256.
For AES decryption to work correctly, the encryption and decryption settings must match. If your workflow uses options such as mode, IV or nonce, padding, and encoding, use the same compatible values on both sides. When a mode requires an IV or nonce, do not reuse the same IV or nonce with the same key. ECB mode is generally not recommended for most security scenarios because repeated plaintext patterns may remain visible in the encrypted result.
• Features
AES Text Encryption: Encrypt text content into AES ciphertext for testing, learning, or development use.
AES Text Decryption: Decrypt AES ciphertext back into readable text when you have the correct key and matching settings.
Common AES Key Lengths: AES commonly uses 128-bit, 192-bit, or 256-bit keys, depending on the implementation and configuration.
Clear Input and Output: Use the tool to compare plaintext, ciphertext, key, IV, mode, padding, and encoding settings when troubleshooting AES results.
Accurate Terminology: This is an AES encryption and decryption tool, not an AES hash generator, file checksum tool, or file encryption tool.
• Application Scenarios
Learning AES Encryption: Understand how AES encrypts plaintext and decrypts ciphertext with a symmetric key.
Development Testing: Check sample AES encryption and decryption results while working with applications, APIs, or backend services.
Encoding Comparison: Compare how output formats such as Base64 or hexadecimal text affect how AES ciphertext is displayed or shared.
Troubleshooting Settings: Verify whether key length, IV or nonce, mode, padding, and encoding settings match between encryption and decryption.
Use this tool for non-sensitive text, examples, and development testing. For real security needs, use a trusted cryptographic library, protect your keys carefully, and avoid pasting secrets into online tools.