Rot13 API

POST https://api.findutils.com/api/tools/rot13/execute

Apply the ROT13 Caesar cipher to text. Self-inverse — running the output through rot13 again recovers the original. Non-letters pass through unchanged.

Try it

Request body

application/json

text

string required

Text to rotate.

Example arguments

Verified

{
  "text": "Hello"
}

curl -X POST https://api.findutils.com/api/tools/rot13/execute \
  -H "Content-Type: application/json" \
  -d '{
    "text": "Hello"
  }'

const response = await fetch('https://api.findutils.com/api/tools/rot13/execute', {
  method: 'POST',
  headers: { 'Content-Type': 'application/json' },
  body: JSON.stringify({"text":"Hello"}),
});
const data = await response.json();

import requests

response = requests.post(
    "https://api.findutils.com/api/tools/rot13/execute",
    json={"text":"Hello"},
)
data = response.json()

$ch = curl_init('https://api.findutils.com/api/tools/rot13/execute');
curl_setopt_array($ch, [
    CURLOPT_POST => true,
    CURLOPT_HTTPHEADER => ['Content-Type: application/json'],
    CURLOPT_POSTFIELDS => '{"text":"Hello"}',
    CURLOPT_RETURNTRANSFER => true,
]);
$data = json_decode(curl_exec($ch), true);

Also an MCP tool

Call rot13 from Claude, Cursor or any MCP client. Same arguments, same output.

https://mcp.findutils.com

MCP reference

Rate limit: 60 a minute, per IP
Auth: None
REST id: rot13
MCP name: rot13
Category: Encoding
Machine-readable: openapi.json · markdown.md

Request body

Example arguments

More Encoding tools

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