ROT13/ROT47 Encoder
Apply ROT13 or ROT47 cipher to encode and decode text instantly.
How to use
Enter your text
Type or paste the text you want to encode or decode with ROT13/ROT47 cipher.
Select cipher mode
Choose ROT13 for letter-only rotation, or ROT47 for all printable ASCII characters.
Copy the result
The output updates in real-time. Click the copy button to copy the result to your clipboard.
Use cases
Hiding spoilers
"ROT13 is commonly used on forums and social media to hide spoilers or puzzle answers from casual readers."
Simple text obfuscation
"Use ROT13/ROT47 to lightly obscure text content such as email addresses to prevent simple scraping."
CTF challenges
"ROT13 and ROT47 are frequently used in capture-the-flag competitions and cryptography puzzles."
Frequently Asked Questions
?What is ROT13?
ROT13 (rotate by 13 places) is a simple letter substitution cipher that replaces each letter with the letter 13 positions after it in the alphabet. Since there are 26 letters, applying ROT13 twice returns the original text, making it self-inverse.
?What is ROT47?
ROT47 is similar to ROT13 but operates on all printable ASCII characters (codes 33-126), not just letters. It rotates each character by 47 positions within the 94 printable characters, making it also self-inverse.
?Is ROT13 a secure encryption method?
No. ROT13 is not encryption and provides no security. It is a simple obfuscation technique meant to hide text from casual reading, not to protect sensitive data. For real security, use proper encryption algorithms.
?Why does applying ROT13 twice give back the original text?
Because there are 26 letters in the English alphabet and ROT13 shifts by 13 positions. Shifting by 13 twice equals shifting by 26, which is a complete cycle back to the starting position.
?Is this ROT13/ROT47 tool safe and private?
Yes. All processing happens locally in your browser. No data is transmitted to any server, making it safe for processing any text content.