ROT13 is a simple letter substitution cipher that replaces each letter with the 13th letter after it in the alphabet. Since there are 26 letters, encoding and decoding are the same operation.

What is the relationship between ROT13 and Caesar cipher?

ROT13 is a special case of the Caesar cipher with a shift of 13. The Caesar cipher can use any shift from 1-25, while ROT13 is fixed at 13. This tool supports custom-shift Caesar ciphers.

ROT47 is an extension of ROT13 that operates on ASCII printable characters 33-126, shifting each by 47 positions. Unlike ROT13, ROT47 also transforms digits and punctuation.

No. ROT13 is not an encryption algorithm - it is simple obfuscation. It is commonly used to hide spoilers and puzzle answers, but should never be used to protect sensitive information.

Is my data uploaded to a server?

No. All conversion logic runs locally in your browser. Your data never leaves your device.

🔒 ROT13 Encoder/Decoder

ROT13/ROT47/Caesar cipher encoder and decoder with real-time preview and custom shift

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ROT13

ROT47

Caesar Cipher

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🔒 ROT13 Encoder/Decoder

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What is ROT13 Encoder/Decoder?

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What is ROT13 Encoder/Decoder?

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