MyAITools
Cipher

ROT13

ROT13 is a free online cipher that helps you apply the ROT13 substitution cipher; letters shift by 13, applying twice returns the original. ROT13 uses 1 input field, returns 1 output value, and runs in your browser on the device.

Key facts

Inputs
1 field: Text
Outputs
1 value: ROT13 result
Runtime
your browser on the device
Mode
Cipher
Privacy
Files and text stay in the browser session.
Cost
$0, no account required

How to use ROT13

  1. 1

    Paste or fill in the input

    Enter your text or values into the input fields on the page.

  2. 2

    Run the utility

    Click Compute to run the utility in your browser and review the result.

  3. 3

    Copy the output

    Copy the output value you need from the result panel.

ROT13 details

First, enter Text in ROT13. Next, review ROT13 result. Additionally, ROT13 uses 1 input field and 1 output block so the result is easy to scan and copy.

ROT13 ("rotate by 13 places") is a simple letter-substitution cipher that replaces each letter with the one 13 positions later in the alphabet. Since the Latin alphabet has 26 letters, applying ROT13 twice gives the original text; it's its own inverse. Useful for hiding spoilers or puzzle answers. Runs entirely in your browser.

Common searches

  • rot13
  • rot13 encoder
  • rot13 decoder
  • rot 13 cipher
  • caesar 13 cipher
  • rot13 translator

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Tools that work with the same formats — most users open one of these next.

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HTML Decode

Decode HTML entities back to plain text — handles numeric (&#NNN; / &#xNNN;) and the common named entities.

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Decode 8-bit binary (groups of 0/1) back to UTF-8 text — space- or comma-separated.

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Frequently asked

What is ROT13?

ROT13 is a free online cipher that helps you apply the ROT13 substitution cipher; letters shift by 13, applying twice returns the original. ROT13 uses 1 input field, returns 1 output value, and runs in your browser on the device.

What inputs and outputs does ROT13 use?

ROT13 uses 1 input field: Text. ROT13 returns 1 output value: ROT13 result.

Do my files and data stay private?

Yes. ROT13 runs entirely in your browser using your device's CPU. Files and text are never uploaded to our servers, so your data stays private.

How do I use ROT13?

Open ROT13, paste or fill in the input fields, and the result updates instantly. ROT13 runs in your browser with no upload and no waiting.

Which browsers does ROT13 support?

Any modern browser works in Chrome, Firefox, Safari, and Edge on desktop and mobile. ROT13 uses standard web APIs and does not require any plugin, extension, or sign-up.