What is AES encryption?

AES (Advanced Encryption Standard) is the most widely used symmetric encryption algorithm. It encrypts data in 128-bit blocks using keys of 128, 192, or 256 bits. AES-256 is considered secure against all known attacks.

What is the difference between AES-128 and AES-256?

AES-128 uses a 128-bit key (16 bytes) and 10 encryption rounds. AES-256 uses a 256-bit key (32 bytes) and 14 rounds. AES-256 provides a higher security margin but is slightly slower. Both are considered cryptographically secure.

AES Encrypt & Decrypt — AES-128 / AES-256 Cipher

How to Use aes-cipher

Paste or enter your input into the text field.
Configure any options (format, delimiter, encoding, or mode) using the controls above the output.
The result updates instantly — no submit button required for most operations.
Click Copy or Download to take the output to your next step.

Encrypt and decrypt text with AES-128 or AES-256. Free and browser-based — everything runs in your browser's JavaScript engine with no data sent to any server.

How aes-cipher Works

aes-cipher is a browser-side security utility built for speed and simplicity. Paste your input and the result appears within milliseconds. The tool handles edge cases — empty inputs, special characters, large datasets — without crashing or producing silent incorrect output. If you need a related operation, check the Related Tools section below.

Accepts large inputs — no size limits imposed by this tool
Handles edge cases: empty fields, special characters, and Unicode
Copy-to-clipboard and file download for every output
Works on Chrome, Firefox, Safari, and Edge without any extensions

Frequently Asked Questions

What does aes-cipher do?

aes-cipher encrypt and decrypt text with aes-128 or aes-256. Results appear immediately — no page reloads, no waiting for a server response.

What input does aes-cipher accept?

Paste text directly into the input field, or type your data. Most operations handle Unicode, special characters, and multi-line inputs without issue.

How large an input can I process?

There is no hard limit imposed by this tool. Very large inputs (multi-MB text) process within your browser's available memory. For files larger than 50 MB, a command-line tool may be faster.

Can I download the output?

Yes — every output panel includes a Copy to Clipboard button and a Download as file option. Outputs are saved as plain text or the appropriate file format for the operation.

Explore the full suite of Security tools and 290+ other free utilities at Chunky Munster.

AES Encrypt & Decrypt online

Encrypt and decrypt text with AES-128 or AES-256 — runs entirely in your browser