ROT13 Encoder/Decoder

Encode or decode text using ROT13 cipher.

Input Text

ROT13 Result

What Is ROT13?

ROT13 (rotate by 13 places) is a simple letter substitution cipher that replaces a letter with the 13th letter after it in the alphabet. ROT13 is a special case of the Caesar cipher which was developed in ancient Rome. Because there are 26 letters in the English alphabet, ROT13 is its own inverse; that is, to undo ROT13, the same algorithm is applied, so the same action can be used for encoding and decoding.

ROT13 Encoder/Decoder Examples

Click to try!

Encode a message with ROT13

This example shows how to encode a simple message using ROT13 cipher.

Decode a ROT13 message

This example shows how to decode a message that was encoded with ROT13.

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