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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rot-13

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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 use

Hidden 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

Pro tips Master online crypto tools

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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ROT-13 Encode Data

Quickly encrypt data using the ROT13 substitution cipher.

ROT-13 Decode Data

Quickly decrypt data that was encrypted with ROT13.

ROT-47 Encode Data

Quickly encrypt data using the ROT47 substitution cipher.

ROT-47 Decode Data

Quickly undo ROT47 encryption and find the original message.

Analyze Letter Frequency

Quickly count letters in the given text and print their distribution.

Analyze Word Frequency

Quickly count words in the given text and print their distribution.

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ROT-2 Encrypt/Decrypt

Encrypt and decrypt numbers using ROT2 cypher.

ROT-5 Encrypt/Decrypt

Encrypt and decrypt numbers using ROT5 cypher.

ROT-n Encrypt/Decrypt

Encrypt and decrypt numbers using custom ROT cypher.

Base26 Encode/Decode

Encode and decode data to/from base26 encoding.

Base32 Encode/Decode

Encode and decode data to/from base32 encoding.

Base58 Encode/Decode

Encode and decode data to/from base58 encoding.

Base62 Encode/Decode

Encode and decode data to/from base62 encoding.

Base64 Encode/Decode

Encode and decode data to/from base64 encoding.

ASCII85 Encode/Decode

Encode and decode data to/from ASCII85 encoding.

XOR Encrypt/Decrypt

Encrypt and decrypt data using the XOR algorithm.

AES Encrypt/Decrypt

Encrypt and decrypt data using the AES algorithm.

RC2 Encrypt/Decrypt

Encrypt and decrypt data using the RC2 algorithm.

RC4 Encrypt/Decrypt

Encrypt and decrypt data using the RC4 algorithm.

RC5 Encrypt/Decrypt

Encrypt and decrypt data using the RC5 algorithm.

RC6 Encrypt/Decrypt

Encrypt and decrypt data using the RC6 algorithm.

Akelarre Encrypt/Decrypt

Encrypt and decrypt data using the Akelarre algorithm.

Ake98 Encrypt/Decrypt

Encrypt and decrypt data using the Ake98 algorithm.

DES Encrypt/Decrypt

Encrypt and decrypt data using the DES algorithm.

Triple DES Encrypt/Decrypt

Encrypt and decrypt data using the 3DES algorithm.

Rabbit Encrypt/Decrypt

Encrypt and decrypt data using the Rabbit cipher.

Blowfish Encrypt/Decrypt

Encrypt and decrypt data using the Blowfish cipher.

Twofish Encrypt/Decrypt

Encrypt and decrypt data using the Twofish cipher.

KASUMI Encrypt/Decrypt

Encrypt and decrypt data using the KASUMI cipher.

Serpent Encrypt/Decrypt

Encrypt and decrypt data using the Serpent cipher.

Solitaire Encrypt/Decrypt

Encrypt and decrypt data using the Solitaire cipher.

Break a Substitution Cipher

Decode text encrypted with a simple substitution cipher.

Generate Random Numbers

Print a list of random numbers.

Generate Primes

Print a list of prime numbers.

Generate Twin Primes

Print a list of twin prime numbers.

Generate Cousin Primes

Print a list of cousin prime numbers.

Generate Prime Triplets

Print a list of prime triplets.

Generate Random Primes

Print a list of random prime numbers.

Check Prime Numbers

Check if the given numbers are prime numbers.

Create Random Passwords

Generate one or more random passwords.

Replace Message Alphabet

Rewrite the given message with a new alphabet.

Calculate Text Entropy

Compute the Shannon entropy of the given message.

Generate High Entropy Data

Create text with high Shannon entropy.

Generate Low Entropy Data

Create text with low Shannon entropy.

Analyze Random Data

Perform statistical analysis of random data.

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We're Browserling — a friendly and fun cross-browser testing company powered by alien technology. At Browserling our mission is to make developers' lives easier, so we created this collection of online cryptography tools. Unlike many other tools, we made our tools free, without ads, and with the simplest possible user interface. Our online crypto tools are actually powered by our programming tools that we created over the last couple of years. Check them out!

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