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ROT13 / ROT47 / Caesar
Shift-cipher text encoder/decoder. ROT13 is self-inverting (rotates letters by 13), ROT47 covers all printable ASCII, and a general Caesar shift lets you pick any offset. 100% client-side.
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Output
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ROT13, ROT47, and Caesar Cipher
Classic rotation ciphers. ROT13 shifts each Latin letter by 13 positions — because 13 is half of 26, applying it twice returns the original. Common in Usenet to hide spoilers. ROT47 extends the idea to the 94 printable ASCII characters (! to ~). Caesar is the general case — pick any shift.
Important
These are not encryption. Anyone can decode in seconds. Use them for puzzles, obfuscation, or hiding spoilers — never for secrets.
Self-inverting
ROT13 undoes itself; apply twice to get back the original.
Fully private
Text never leaves your browser.
Three variants
ROT13, ROT47, or custom Caesar shift.