ROT13/시저 암호
무료 ROT13 및 시저 암호 도구. 글자를 원하는 만큼 이동시킵니다. 글자는 알파벳을 순환하며, 글자 이외의 문자는 그대로 유지됩니다. 퍼즐 및 난독화용.
Runs in your browserUpdated Apr 26, 2026
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자주 묻는 질문
›What's ROT13?
Caesar cipher with a shift of 13. Because the English alphabet has 26 letters, applying ROT13 twice gives back the original — you don't need separate encode/decode.
›Is ROT13 secure?
Not at all — it's a 2,000-year-old cipher with 25 possible shifts. Use it only for spoiler tags or trivial obfuscation, never for security.
›Can I use a different shift?
Yes — pick any number from 1 to 25. ROT13 is just shift=13.
›Are uppercase and lowercase preserved?
Yes — case is preserved through the shift. Numbers and punctuation pass through unchanged.
›Is the tool free?
Yes — fully free, no signup.