This tool applies the ROT13 cipher, rotating each letter 13 places — its own inverse, so the same action encodes and decodes. Runs in your browser.
How to use it
- Paste text to encode or decode.
- Each letter is rotated 13 places.
- Copy the ROT13 result.
About ROT13 Encoder / Decoder
ROT13 is a classic letter-substitution cipher that shifts each letter 13 positions in the alphabet. Because the alphabet has 26 letters, applying it twice returns the original text, so the same tool both encodes and decodes. It is used for lightly obscuring spoilers and puzzle answers — not for real security. This tool runs entirely in your browser.
FAQ
Is ROT13 secure?
No — ROT13 offers no real security; it only lightly obscures text, e.g. hiding spoilers.
How do I decode ROT13?
Apply ROT13 again — it is its own inverse, so encoding and decoding are the same operation.
Does it affect numbers?
No, only letters A–Z are rotated; numbers and symbols pass through unchanged.