Free Toolkit

AES Encrypt/DecryptEncrypt and decrypt text using AES with a passphrase.

AES Encrypt/Decrypt illustration
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AES Encrypt/Decrypt

Encrypt and decrypt text using AES with a passphrase.

How to Use
1

Enter Input

Type or paste your input.

2

View Output

Results appear in real time.

3

Copy Result

Click Copy to copy the output.

What Is AES Encrypt/Decrypt?

AES is the most widely used symmetric encryption (NIST 2001). This tool uses AES-256 via crypto-js with passphrase key derivation. Random salt and IV per encryption. Base64 output. 100% client-side.

Why Use Our AES Encrypt/Decrypt?

  • Fast, accurate processing
  • 100% client-side — data never leaves your browser
  • Free online tool with no signup required
  • Mobile-friendly with 44px touch targets

Common Use Cases

Development

Use in software development workflows.

Security

Cryptographic and security applications.

Education

Learn about algorithms and techniques.

Verification

Verify and validate data integrity.

Technical Guide

crypto-js generates random 8-byte salt, derives 256-bit key and IV via EVP_BytesToKey. PKCS7 padding, AES-256-CBC. Output: Salted__ + salt + ciphertext, Base64-encoded. CBC provides semantic security.

Tips & Best Practices

  • 1
    All processing happens in your browser
  • 2
    Results are deterministic for the same input
  • 3
    Use Copy button to quickly grab output
  • 4
    Works on mobile devices with touch-friendly interface

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Frequently Asked Questions

QIs this tool free?
Yes, completely free with no signup required.
QIs my data secure?
Yes. All processing is 100% client-side.
QDoes it work on mobile?
Yes, with responsive design and touch-friendly controls.
QWhat browsers are supported?
All modern browsers including Chrome, Firefox, Safari, and Edge.
QCan I use this offline?
The tool requires an initial page load but processes data locally.

About AES Encrypt/Decrypt

AES Encrypt/Decrypt is a free online tool from FreeToolkit.ai. All processing happens directly in your browser — your data never leaves your device. No registration required. No ads. Just fast, reliable tools.