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Encoders & Ciphers

ROT13 Encoder & Decoder

Encode and decode text with ROT13, ROT5, ROT18 or ROT47. The same step does both, because ROT13 undoes itself. Free online tool.

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What is the ROT13 Encoder & Decoder?

ROT13 moves each letter 13 places in the alphabet. Because the alphabet has 26 letters, doing it twice brings you back to the start. That means one tool both encodes and decodes.

You can also try ROT5 for digits, ROT18 for letters and digits, and ROT47 for letters, digits and most signs. ROT13 is used to hide spoilers and puzzle answers, not for security.

How to use it

  1. Type or paste your text in the left box.
  2. Pick ROT13, ROT5, ROT18 or ROT47.
  3. Copy the result. Run it again to get your text back.

Why people like this tool

Four variants

ROT13, ROT5, ROT18 and ROT47.

Same step both ways

Encode and decode are the same.

Keeps the rest

Spaces and unknown signs stay.

Instant

The result updates as you type.

How it works, in one picture

Infographic: how to use the ROT13 Encoder & Decoder in 3 easy steps: Add your text, Choose your options and Copy the result. You get: Four variants, Same step both ways, Keeps the rest and Instant.

Frequently asked questions

What is ROT13?
It is a simple letter swap where each letter is moved 13 places. A becomes N and N becomes A.
How do I decode ROT13?
Paste the ROT13 text in this tool. It is the same step as encoding.
What are ROT5, ROT18 and ROT47?
ROT5 moves digits by 5. ROT18 is ROT13 plus ROT5. ROT47 moves most printable signs by 47 places.
Is ROT13 encryption?
No. It only hides text from a quick look. Anyone can undo it.

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