ROT13 Converter
Apply ROT13 to text (encode/decode). ROT13 shifts letters by 13 positions and is fully reversible. Runs locally in your browser.
Input
Output
Tip: You can verify in DevTools → Network that nothing is uploaded.
About this ROT13 Converter
ROT13 Converter applies a simple letter substitution where A↔N, B↔O, and so on. Running ROT13 twice returns the original text.
This is commonly used for light obfuscation (spoilers, puzzles) and quick reversible masking. It is not secure encryption.
- Process text data quickly without external tools
- Transform content for development workflows
- Clean and format text for analysis
- Enable Auto to transform as you type
- Upload text files directly from your device
- Download the result when done
FAQ
No. Everything runs locally in your browser. Nothing you paste is sent to a server.
After the page loads once, it will typically keep working offline (unless you hard refresh with no cache).
No. Your input stays in your browser. Only optional preferences like theme or language may be stored.
Any plain text. You can paste text directly into the input box.
No. ROT13 is not secure. It is a simple reversible substitution with no secret key.
No. Only letters A–Z and a–z are transformed. Numbers, punctuation, and whitespace remain unchanged.
Because shifting by 13 twice returns to the original letter (26-letter alphabet).