ROT13 Encoder / Decoder
Encode and decode text using ROT13, ROT5, ROT47 and ROT13+5 ciphers
Input Text
Encoded / Decoded Result
Usage Examples
Hide Spoilers
Use ROT13 to hide movie, book or game spoilers in online discussions. Readers can decode when ready.
Simple Obfuscation
Obfuscate text with ROT13+5 to encode both letters and numbers for casual text hiding.
Puzzle & Cipher Games
Create cipher puzzles and decode ROT13 encoded messages for treasure hunts and puzzle games.
Features
Self-Reversing Cipher
ROT13 is its own inverse - apply it twice to get back the original text
Real-Time Encoding
Text is encoded instantly as you type, no button click needed
Multiple Cipher Modes
ROT13 for letters, ROT5 for numbers, ROT47 for all ASCII, and ROT13+5 combined
Privacy First
All processing happens locally in your browser, no data sent to servers
How to Use?
Choose Cipher Mode
Select a cipher mode: ROT13, ROT5, ROT47 or ROT13+5 depending on what you want to encode.
Enter Text
Type or paste your text. The encoded result appears instantly in real-time.
Copy or Swap
Copy the result to clipboard, or use Swap to move the output back to input for verification.
Frequently Asked Questions
What is ROT13?
ROT13 is one of those classic ciphers every developer bumps into sooner or later. It shifts each letter by 13 positions in the alphabet, and since there are exactly 26 letters, applying it twice brings you right back to the original. This tool lets you encode and decode text instantly with ROT13, ROT5, ROT47, and ROT13+5 modes.
Four Cipher Modes in One Tool
ROT13 handles letters, ROT5 takes care of digits (shifting by 5), ROT47 covers all printable ASCII characters, and ROT13+5 combines letter and number rotation. Pick the mode that fits your use case - whether you are hiding a spoiler or building a puzzle game.
Common Use Cases
People use ROT13 to hide spoilers in forums and Reddit posts, create simple cipher puzzles for treasure hunts, obfuscate email addresses from basic scrapers, and teach kids about cryptography basics. It is not security - it is a fun, practical text trick.
How This Compares to Real Encryption
ROT13 is a Caesar cipher with a fixed shift of 13. It provides zero security against anyone who knows what it is (which is everyone). For actual encryption, you would use AES or similar. ROT13 is purely for casual obfuscation where the goal is to prevent accidental reading, not determined decryption.
Privacy and Browser Processing
Everything runs in your browser using JavaScript. Your text never leaves your device - no server requests, no logging, no cookies tracking what you encode. Type or paste your text and the result appears instantly.