# Rot13 decoder

World's simplest crypto tool
This browser-based utility undoes ROT13 and decrypts data that was previously encrypted with the ROT13 substitution cipher. The decryption is performed by unshifting the input text by minus 13 characters and you get plain text in the output. Created by cryptonerds from team Browserling.

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## What is a rot13 decoder?

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This online utility decodes textual data that was earlier encrypted with the (weak) ROT13 encryption algorithm. This algorithm is a simple substitution-based method for obfuscating data. It's commonly used in online chat rooms and forums as a quick way to hide or obscure offensive comments, hints, spoilers, and punchlines. ROT13 is short for "rotate 13 places" and it's a variant of a Caesar cipher. The original Caesar algorithm shifted text by 3 positions but ROT13 shifts it by 13.

## Rot13 decoder examples

Click to useHidden Treasure

This example deobfuscates a message left by pirates to the hidden treasure. Now we know where to look for it!

Gur gernfher vf uvqqra uvture guna svir gubhfnaq srrg nobir frn yriry.

The treasure is hidden higher than five thousand feet above sea level.

Digits Don't Work

In this example, we demonstrate that decrypting ROT13 data that contains digits has no effect as digits don't get rotated and stay static.

2000/04/14 ng 7:30nz

2000/04/14 at 7:30am

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You can pass input to this tool via

__?input__query argument and it will automatically compute output. Here's how to type it in your browser's address bar. Click to try!
https://onlinecryptotools.com/rot13-decrypt-data

__?input__=Gur%20gernfher%20vf%20uvqqra%20uvture%20guna%20svir%20gubhfnaq%20srrg%20nobir%20frn%20yriry.
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Print a list of cousin prime numbers.

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