ROT13 Converter

Transform text with the ROT13 substitution cipher.

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Tool

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What is ROT13?

ROT13 is a Caesar cipher that shifts letters by 13 positions. Applying it twice gives back the original text, making it useful for simple obfuscation such as hiding spoilers.

How to Use

  1. Enter text in the input field.
  2. Click "Convert" to apply ROT13.
  3. Applying ROT13 twice returns the original text.
  4. Click "Copy Result" to copy to clipboard.

FAQ

What is ROT13?

ROT13 shifts each letter 13 positions in the alphabet. Because the alphabet has 26 letters, applying ROT13 twice restores the original text.

Does it work with Japanese?

ROT13 only transforms Latin letters. Japanese characters, digits, and symbols pass through unchanged.

Is it suitable for security use?

No. ROT13 is a very simple transformation and is not suitable for security purposes. It is mainly used for hiding spoilers or puzzles.