What is ROT13?

Question 1

What is ROT13?

Accepted Answer

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 - applying ROT13 twice restores the original text.

Question 2

What is the relationship between ROT13 and Caesar cipher?

Accepted Answer

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.

Question 3

What is ROT47?

Accepted Answer

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, not just letters.

Question 4

Is ROT13 secure?

Accepted Answer

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

Question 5

Does ROT13 work with non-English text?

Accepted Answer

ROT13 only affects English letters A-Z/a-z. Non-English characters (Chinese, Arabic, etc.) are preserved unchanged. ROT47 can handle some ASCII printable characters but also doesn't affect non-ASCII text.

Question 6

Is my data uploaded to a server?

Accepted Answer

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

Question 7

Does it support batch processing?

Accepted Answer

Yes. You can input multi-line text for batch conversion, with each line processed independently. File drag-and-drop is also supported.

🔐 ROT13 Encoder/Decoder

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