ROT13 cipher shifts each letter 13 positions in the alphabet, making encoding and decoding identical operations. Access via MCP in Cursor or Windsurf, or call GET /v1/encode/rot13 directly. Pass "Hello World" and get "Uryyb Jbeyq" — apply ROT13 again to decode back. Numbers and symbols remain unchanged, only A-Z letters rotate.
curl "https://tinyfn.io/v1/encode/rot13" \
-H "X-API-Key: YOUR_API_KEY"const response = await fetch('https://tinyfn.io/v1/encode/rot13', {
headers: { 'X-API-Key': 'YOUR_API_KEY' }
});
const data = await response.json();
console.log(data);import requests
response = requests.get('https://tinyfn.io/v1/encode/rot13',
headers={'X-API-Key': 'YOUR_API_KEY'})
data = response.json()
print(data)Connect your AI agent (Claude, Cursor, Windsurf, etc.) to TinyFn's encoding tools:
{
"mcpServers": {
"tinyfn-encoding": {
"url": "https://tinyfn.io/mcp/encoding",
"headers": {
"X-API-Key": "YOUR_API_KEY"
}
}
}
}ROT13 shifts each letter 13 positions forward in the alphabet (A→N, B→O, etc.). Since there are 26 letters, applying ROT13 twice returns the original text.
No, ROT13 is trivially reversible and provides no security. It's used for spoiler text, puzzle solutions, or basic obfuscation where you want easily reversible transformation.
Only A-Z and a-z letters are transformed. Numbers, punctuation, spaces, and special characters remain unchanged. Case is preserved (A→N, a→n).
Apply ROT13 again to the encoded text. Since it's a 13-position shift in a 26-letter alphabet, encoding and decoding are the same operation.
No, ROT13 only works with ASCII A-Z letters. Accented characters, emojis, and non-Latin scripts pass through unchanged.