ROT Cipher
Encrypt and decrypt text using ROT13 or Caesar Cipher
Instantly encode or decode text using rotation ciphers. Our online tool supports the internet-standard ROT13, the high-density ROT47, and fully customizable Caesar shifts. Perfect for simple text obfuscation and learning about classical cryptography.
Cipher Type
Input Text
Output Result
About ROT Ciphers
Rotation ciphers are simple substitution ciphers where each letter in the text is replaced by a letter some fixed number of positions down the alphabet.
Common Variations:
• ROT13: Replaces a letter with the 13th letter after it. Since there are 26 letters, it is its own inverse.
• Caesar Cipher: The original cipher used by Julius Caesar, typically with a shift of 3.
• ROT47: Similar to ROT13 but covers all printable ASCII characters by shifting by 47 positions.
Fast Text Obfuscation with Rotation Ciphers
A Rotation Cipher is one of the oldest and simplest forms of encryption. Each letter in the message is replaced by a letter found by "rotating" the alphabet by a certain number of steps. While not secure for protect sensitive bank data, these ciphers are widely used on the internet for hiding spoilers, jokes, and hints.
Our Online ROT Cipher Tool provides a suite of rotation methods for any occasion.
Supported Cipher Variations
1. ROT13 (Internet Standard)
The most common variant. It rotates letters by 13 positions. Since the English alphabet has 26 letters, applying ROT13 twice returns the original text.
- Use Case: Hiding movie spoilers in forums or obfuscating email addresses to avoid basic spam bots.
2. Caesar Cipher (Custom Shift)
Named after Julius Caesar, who used it for his private correspondence with a shift of 3. Our tool lets you choose any shift amount (e.g., +5, -1, +25).
- Use Case: Creating puzzles, geocaching clues, or learning the history of cryptography.
3. ROT47 (Extended ASCII)
Similar to ROT13 but covers all printable ASCII characters (numbers, symbols, and letters). It shifts characters by 47 positions.
- Use Case: For stronger obfuscation that needs to include passwords or mixed-character strings.
Interactive Cipher Features
- Live Preview: Apply ciphers instantly with a single click.
- Quick Presets: Use our pre-built cards to try classic shifts or decode secret examples.
- Bi-directional: The same tool works for both encryption and decryption. In ROT13, the operation is identical!
- Safe Integer Math: We handle wrap-around logic automatically so you don't have to worry about the alphabet's end.
When to Use Rotation Ciphers
| Goal | Recommended Tool |
|---|---|
| Hiding a movie spoiler | ROT13 |
| Solving a classic history puzzle | Caesar Cipher |
| Obfuscating a password string | ROT47 |
| Protecting actual sensitive data | SHA-256 Hash Generator |
Frequently Asked Questions
Is ROT13 secure?
No. ROT13 and Caesar ciphers are "security by obscurity." They can be broken instantly by anyone with a basic knowledge of frequency analysis or by using this tool to try all 26 possible shifts.
How do I decrypt a Caesar shift if I don't know the number?
Simply paste the text and try different Shift Amounts in our tool. Since there are only 25 possibilities (besides the original), you will find the readable text very quickly.
Does it work with capital letters?
Yes! Our algorithm preserves the case of your letters. Hello shifts to Urryb (in ROT13), maintaining the original structure of your sentence.
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