# ROT13 / Caesar Cipher

URL: https://phishdestroy.io/developer-tools/rot13-caesar-cipher
Category: General dev
Where it runs: Runs locally (nothing you enter is uploaded)

Shift every Latin letter by 13 or any other amount; the output updates as you type. ROT13 (PHP's str_rot13) is a common layer in obfuscated phishing-kit and web-shell code, and uggcf:// is its giveaway for https://.

## Example input

ROT13-hidden link

```
uggcf://ybtva.rknzcyr.pbz/irevsl
```

With the default shift of 13 the output is https://login.example.com/verify.

## FAQ

### What exactly is shifted?

Only the Latin letters A–Z and a–z, each moved forward by the shift with wrap-around and its case kept. Digits, punctuation, accented and non-Latin letters stay as they are.

### How do I decode a Caesar shift other than 13?

Use 26 minus the shift (text shifted by 3 decodes with 23) or enter a negative value such as -3. ROT13 is its own inverse; neither is encryption, just a letter substitution anyone can undo.

### Is the text sent anywhere?

No. The shift is applied in your browser as you type.

## Related tools

- [Multi-Layer Decoder](https://phishdestroy.io/developer-tools/multi-layer-decoder)
- [Binary ↔ Text Converter](https://phishdestroy.io/developer-tools/binary-text-converter)
- [Base64 Encoder / Decoder](https://phishdestroy.io/developer-tools/base64-encoder-decoder)
- [String Obfuscator for Filter Testing](https://phishdestroy.io/developer-tools/string-obfuscator)
- [Morse Code Translator](https://phishdestroy.io/developer-tools/morse-code-translator)

All tools: https://phishdestroy.io/developer-tools