编码与加密
ROT13 / 凯撒密码
免费的 ROT13 和凯撒密码工具。按任意数量移位字母。字母在字母表中循环；非字母字符保持不变。适用于谜题和混淆。
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Input
Output
编辑注
Understanding · The world's simplest cipher.
本深度章节目前仅有英文版本。上方的转换工具支持您的语言;长篇说明文章尚未翻译。
常见问题
Quick answers.
›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.
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