ROT13 Encoder / Decoder
Shift every letter 13 places in the alphabet. ROT13 is its own inverse, so run it twice to decode. Free, no signup.
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Frequently Asked Questions
- What is ROT13 used for?
- It is a classic way to hide spoilers or puzzle text. Because the alphabet has 26 letters, applying it twice returns the original.
- Does it change numbers and punctuation?
- No. Only letters move; digits and symbols stay exactly where they are.