ROT13, ROT47 & Caesar Cipher

Encrypt and decrypt classic substitution ciphers instantly. Supports ROT13, full ASCII ROT47, and custom Caesar shifts.

🔒 100% Client-Side Processing
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🔍 All 25 Caesar Shifts (Brute Force Decoder)

Shift Decoded Output

Understanding ROT13 and Caesar Substitution Ciphers

ROT13 is a simple reciprocal substitution cipher that replaces each letter with the 13th letter following it in the Latin alphabet. Because the alphabet contains 26 letters, applying ROT13 twice restores the original text. It is often used on forums, puzzle games, and spoilers.

Frequently asked questions

What does ROT13 & Caesar Cipher do?

Free online ROT13 encoder/decoder, ROT47 cipher, and custom Caesar shift cipher tool. Includes brute-force 25-shift comparison table. 100% private.

How does ROT13 & Caesar Cipher work?

ROT13 is a simple reciprocal substitution cipher that replaces each letter with the 13th letter following it in the Latin alphabet. Because the alphabet contains 26 letters, applying ROT13 twice restores the original text. It is often used on forums, puzzle games, and spoilers.

Where can I find tools related to ROT13 & Caesar Cipher?

Use the related tools below to explore more Text & Content tools.

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We maintain this text & content tool and its usage guide.