ROT13编码与解码工具

使用ROT13对文本进行编码或解码：一种位移13位、且自身互逆的凯撒密码。

如何使用本工具

1
Type or paste your text into the input box.
2
Read the transformed result in the output panel directly below as you type.
3
Click Copy to put the result on your clipboard, then paste it wherever you need it.
4
To decode ROT13 text, paste it into the same input box; running ROT13 again restores the original.

ROT13是最著名的字母替换密码：将每个字母位移13位。由于13恰好是26个字母表的一半，对文本应用两次ROT13便会还原出原始文本。它常用于Usenet帖子中，把剧透和笑点的包袱藏起来，避免被随意读到，而非用于任何真正的安全保护。

Hide a spoiler, plot twist, or puzzle answer in a forum or chat so readers must deliberately decode it.
Reproduce or decode classic Usenet and newsgroup posts that used ROT13 to mask punchlines and offensive jokes.
Teach students the Caesar cipher and modular arithmetic with a concrete, self-inverse example.
Lightly obfuscate a hint or answer key in documentation or a quiz so it is not readable at a glance.
Decode ROT13 strings you encounter in CTF challenges, crackmes, or programming exercises.
Quickly scramble a short note in a non-sensitive context where you only need casual concealment, not real security.

ROT13安全吗？▼

不安全。它只是一种游戏或混淆手段，而非加密。任何人都能瞬间将其解码。