Encode and decode text with ROT13 - locally in your browser, with no upload.
Running locally on your device ...
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Your files never left your device
No. Everything runs in your browser - your file never leaves your device. How this is verifiable
ROT13 ("rotate by 13 places") is a simple letter shift: each letter is replaced by the one 13 positions further in the alphabet. Because the alphabet has 26 letters, applying it twice returns the original text - so the same function both encodes and decodes. ROT13 has been used for decades to hide punchlines, spoilers or solutions so they are not read by accident.
You paste your text and get the ROT13 version; paste a ROT13 version and you get the plain text back. Only the letters A to Z (upper and lower case) are shifted - digits, spaces and punctuation stay unchanged, as do umlauts and other special characters. That keeps the structure of the text intact.
The whole conversion runs entirely locally in your browser in pure JavaScript - your text is not uploaded, not stored, and no foreign library is loaded from a CDN. ROT13 is obfuscation, NOT secure encryption - for real protection use the file encryption tool.
| Input formats | Text input |
|---|---|
| Output format | TXT |
| Batch processing | No |
| Processing | Locally in your browser (JavaScript) |
| File upload | None |
Limitations: ROT13 shifts only the Latin letters A to Z; all other characters (digits, punctuation, umlauts, emojis) stay unchanged. It is pure obfuscation without a key and provides NO security - anyone can reverse it with the same tool.
No. The conversion runs entirely locally in your browser; your text never leaves your device and is not stored.
With the same tool: ROT13 applied twice yields the original text again. Encoding and decoding are the same action.
No. ROT13 is keyless obfuscation and offers no protection. For real security use the file encryption tool with a password.
They stay unchanged. ROT13 only shifts the letters A to Z; everything else passes through untouched.