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ROT13 Cipher

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Security & Encryption

ROT13 Cipher

Encode and decode text using the ROT13 cipher.

Workspace

Run the tool here

Browser utility

Output

Run the workspace to see the response here.

How to use

Paste the text.
Run ROT13 once to encode.
Run it again on the result to decode.

About this tool

Apply ROT13, a reversible letter substitution that shifts each character by 13 places.

ROT13 Cipher is part of the TmpMailer Security & Encryption set — free browser utilities that open instantly, need no account, and pair well with a temporary-email workflow when you just need a quick result.

Common use cases

Hiding a puzzle answer from casual reading.
Demonstrating classical ciphers.
Obfuscating a spoiler in a forum post.

Common questions

Is ROT13 encryption?

No. It is a fixed substitution with no key. It offers no security.

Why are numbers unchanged?

ROT13 only affects Latin letters. Digits and punctuation pass through.

Can it be brute-forced?

It does not need to be: applying ROT13 again reverses it.

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