ROT13 & Caesar Cipher Encoder / Decoder
Free in-browser ROT13 and Classical Substitution Cipher Tool. Easily obfuscate, encode, or decrypt plain text using ROT13 (13-letter shift), ROT5 (numeric rotation), ROT18, ROT47 (full ASCII), Atbash (reversed alphabet), and customizable Caesar cipher shifts (1 to 25 positions). Includes real-time substitution alphabet mapping and 1-click output copying.
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How to Encode / Decode ROT13 in 3 Steps
Choose Algorithm
Select ROT13, Caesar, Atbash, or ROT47 cipher mode.
Enter Text
Type or paste your plaintext message or obfuscated string.
Copy Result
Copy the encrypted or decrypted result with 1-click.
Frequently Asked Questions
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