AES Encryption Tool Online — Encrypt and decrypt text with AES online — Free Online Tool

What is AES?

AES (Advanced Encryption Standard) is a symmetric block cipher adopted by the US government in 2001. It operates on 128-bit blocks and supports 128, 192, and 256-bit keys. AES-256-CBC and AES-256-GCM are the most common modes for secure application data.

DevKits provides a free browser-based aes encryption online tool that processes everything client-side — your data never leaves your machine. No signup, no install, no rate limits.

How to Use the AES Encryption Tool Online

1. 1. Enter the plaintext you want to encrypt.
   2. Enter a strong passphrase (it will be stretched to 256 bits).
   3. Select mode (CBC or GCM).
   4. Click Encrypt and save the ciphertext + IV.

Key Features

• AES-128/192/256
• CBC and GCM modes
• auto IV generation
• base64 output
• decrypt mode
• 100% browser-based — no server processing, complete privacy
• No account required — free forever
• Works on desktop and mobile

Common Use Cases for AES

data encryption, secure config storage, client-side secrets. Developers use this tool daily to speed up debugging, validate outputs, and automate repetitive data tasks.

Frequently Asked Questions

Is the AES Encryption Tool completely free?

Yes. The aes encryption online tool on DevKits is free with no usage limits. There is no signup, no paywall, and no rate limiting.

Is my data safe when I use this tool?

Absolutely. All processing happens in your browser using JavaScript. No data is transmitted to any server. You can even use it offline after the page loads.

What browsers are supported?

All modern browsers — Chrome, Firefox, Safari, and Edge. The tool also works on mobile browsers.

Can I use this tool for AES in production applications?

This online tool is ideal for development, debugging, and testing. For production use, implement the same algorithm in your application code using standard libraries. The tool helps you understand expected inputs and outputs before writing code.

Are there any file size limits?

Since everything runs in your browser, the practical limit is your device's available memory. For most text-based inputs, there are no restrictions.