ROT13 Encoder
ROT13 encode and decode
What is ROT13?
ROT13 is a simple letter substitution cipher. Applying ROT13 twice returns the original text.
How to Use
- Paste text to encode or decode.
- Output updates automatically.
- Copy transformed text.
Tips & Notes
All processing runs locally in your browser. Your text is never uploaded to our servers.
Frequently Asked Questions
Is ROT13 encryption secure?
No. It is a reversible obfuscation for puzzles and fun, not security.
Related Tools
Try Reverse Text, Case Converter.
How It Works
Shifts A–Z and a–z by 13; other characters unchanged. Encode and decode are the same operation.