ROT13 Encoder/Decoder
Encode and decode text using the classic ROT13 substitution cipher.
How it works
ROT13 is a simple substitution cipher that rotates letters by 13 positions in the alphabet. Since there are 26 letters, applying ROT13 twice to the same text restores it to its original form.
Frequently asked questions
What is the ROT13 cipher?
ROT13 (Rotate by 13 places) is a special case of the Caesar cipher, historically used in online forums to hide spoilers, puzzle answers, and joke punchlines.
Does ROT13 encode numbers and special characters?
No. The cipher only shifts letters from A-Z (uppercase and lowercase). Numbers, punctuation, spaces, and symbols are left unchanged.
Is ROT13 secure for hiding sensitive data?
No. ROT13 provides no real cryptographic security and can be easily broken. Use it only for entertainment or simple text obfuscation (like spoilers).