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ROT13 Encoder

Encode text using the ROT13 cipher. Shifts each letter by 13 positions in the alphabet. Numbers and symbols are unchanged.

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How to Use

  1. 1

    Enter your text

    Type or paste the text you want to ROT13-encode.

  2. 2

    Click Encode ROT13

    Each letter is shifted by 13 positions. A→N, B→O, ..., N→A. Numbers and symbols stay unchanged.

  3. 3

    Copy the result

    Click Copy to copy the encoded text.

What is ROT13 Encoder?

ROT13 ("rotate by 13 places") is a simple letter substitution cipher that replaces each letter with the letter 13 positions after it in the alphabet. Since the English alphabet has 26 letters, applying ROT13 twice returns the original text — the same function encodes and decodes.

ROT13 is not encryption — it provides zero security. It's used to obscure spoilers, puzzle answers, and offensive content in forums, Usenet, and email so that the text isn't immediately readable at a glance.

FAQ

Is ROT13 secure?
No. ROT13 is a trivial cipher — anyone who knows the scheme can decode it instantly. It's meant for casual obfuscation (hiding spoilers, etc.), not for protecting sensitive data. Use AES or other modern encryption for security.
Does ROT13 work with non-English letters?
Only A-Z and a-z letters are shifted. Accented characters, Cyrillic, CJK, numbers, and symbols pass through unchanged.
How do I decode ROT13?
Apply ROT13 again. Since 13+13=26 (the alphabet length), encoding and decoding are the same operation.

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