What is the ROT13 tool?

Rotate letters by 13 positions. This free online tool is available at NumbersChecker with no login required.

Is the ROT13 tool free?

Yes, the ROT13 tool is completely free to use at NumbersChecker. No account or installation is needed — results are instant.

How do I use the ROT13 tool?

Enter your input into the form at https://numberschecker.com/tool/rot13, click Run, and the result appears instantly. Click any result value to copy it to your clipboard.

Is there an API for the ROT13 tool?

Yes. Send a POST request to https://numberschecker.com/api/rot13 with your input as a JSON body. The API is free and requires no authentication.

Ciphers rotateencryptdecrypt

ROT13

Rotate letters by 13 positions.

About the ROT13 Tool

Rotate letters by 13 positions. This free online tool runs entirely in your browser — no login, no installation, and no data is stored.

This tool is part of the Ciphers category on NumbersChecker. Browse all Ciphers tools or explore all 139 tools.

Related: rotate · encrypt · decrypt

API usage

POST /api/rot13
Content-Type: application/json

{
  "text": "your input here"
}