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ROT13 Cipher

Instantly encode or decode text with the ROT13 substitution cipher.

Your text

ROT13 is its own inverse, so applying it twice returns the original text.

How to use the ROT13 Cipher

  1. Type or paste your text.
  2. Click Apply ROT13 to transform it.
  3. Copy the result, or click again on the output to reverse it.

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Frequently Asked Questions

Common questions about the free online rot13 cipher.

ROT13 is a Caesar cipher with a fixed shift of 13, so each letter is replaced by the one 13 places further along the alphabet.
Simply apply ROT13 again. Because the alphabet has 26 letters, the cipher is its own inverse.
No. It offers no security at all and is used for hiding spoilers, puzzle answers and jokes rather than protecting data.
It is a lightweight way to avoid accidentally reading spoilers or puzzle solutions in a forum post.
No, only letters are affected; digits, spaces and symbols stay the same.
ROT5 shifts digits and ROT18 combines ROT13 with ROT5. This tool applies ROT13 to letters only.
Yes. The tool is fully responsive and works in any modern browser on desktop, tablet and phone.
Yes, it is completely free with no account required.

Last updated: October 10, 2026