Text Cipher – ROT13, Caesar, AES Encryption Tool

Encrypt and decrypt text with ROT13, Caesar cipher brute-force, or AES-256-GCM. Educational fun cryptography tool.

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Features

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ROT13

Classic simple cipher where each letter is shifted 13 positions. Encoding and decoding are the same operation.

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Caesar Brute Force

Shift cipher with all 25 possible shifts shown at once. Find the correct shift by reading through results.

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AES-256-GCM

Military-grade encryption with PBKDF2 key derivation. Enter a password to encrypt/decrypt.

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Real-Time

Encryption and decryption update instantly as you type.

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Privacy First

Uses Web Crypto API for AES. All processing is local. Your data never leaves your device.

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Copy Results

Copy encrypted or decrypted text with one click.

How to Use

1

Choose Cipher

Select ROT13, Caesar (with brute force), or AES-256-GCM encryption.

2

Enter Text

Type or paste the text you want to encrypt or decrypt.

3

For AES: Enter Password

AES requires a password to derive the encryption key.

4

View & Copy

View the result and copy to your clipboard.

Frequently Asked Questions

What is ROT13?
ROT13 (rotate by 13) shifts each letter 13 positions in the alphabet. Since the alphabet has 26 letters, applying ROT13 twice returns the original text. It's a simple cipher used in puzzles.
What is a Caesar cipher?
A Caesar cipher shifts each letter by a fixed number of positions. For example, a shift of 3 turns A into D. The brute-force mode shows all 25 possible shifts at once.
Is AES-256-GCM secure?
AES-256-GCM is considered military-grade encryption. It's the same standard used by governments and banks. The key is derived from your password using PBKDF2 with 100,000 iterations.
Why does AES output look random?
AES output includes a random initialization vector (IV) which makes the ciphertext different each time even with the same password. The IV is prepended to the output and extracted during decryption.
Is my data sent to a server?
No. All encryption uses the Web Crypto API locally in your browser. Your text and passwords never leave your device.

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