ROT13
Encode or decode ROT13 cipher. A simple letter substitution cipher that replaces a letter with the one 13 places after it.
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How to Use
- 1Enter text.
- 2See ROT13 output instantly.
- 3Copy the result.
What is ROT13?
ROT13 Encoder/Decoder applies the ROT13 cipher to text. Since ROT13 is its own inverse, applying it twice returns the original text. It only affects letters A-Z and a-z.
Key Features
- Encode and decode
- Preserves non-letter characters
- Case-preserving
- Real-time conversion
- 100% client-side
FAQ
Is ROT13 secure?
No. ROT13 is not encryption — it is a simple substitution cipher that is easily reversed. It is mainly used for hiding spoilers or punchlines.
Does it affect numbers?
No. ROT13 only affects letters. Numbers, spaces, and punctuation remain unchanged.