ROT13編碼與解碼工具

使用ROT13對文字進行編碼或解碼：一種位移13位、且自身互逆的凱撒密碼。

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是最著名的字母替換密碼：將每個字母位移13位。由於13恰好是26個字母表的一半，對文字套用兩次ROT13便會還原出原始文字。它常用於Usenet貼文中，把劇透和笑點的包袱藏起來，避免被隨意讀到，而非用於任何真正的安全保護。

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安全嗎？▼

不安全。它只是一種遊戲或混淆手段，而非加密。任何人都能瞬間將其解碼。