ROT13 Converter

Encode/decode text using ROT13 cipher.

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Features

Simple Letter Substitution

Replaces each letter with the 13th letter after it in the alphabet.

Symmetrical Cipher

Applying ROT13 twice returns the original text.

Instant Two-Way Conversion

Type in either box to see the immediate conversion in the other.

About ROT13 Converter

ROT13 ("rotate by 13 places") is a simple letter substitution cipher that replaces a letter with the 13th letter after it in the alphabet. It's a Caesar cipher with a fixed shift of 13. This tool provides a fun and easy way to encode and decode messages, often used in online forums to hide spoilers or jokes.

How to Use ROT13 Converter

  • 1
    Enter Text

    Type or paste your message into the "Plain Text" box on the left to encode it.

  • 2
    Enter Cipher

    Alternatively, type a ROT13-encoded message into the "ROT13 Text" box on the right to decode it.

  • 3
    View Result

    The conversion happens instantly in the opposite text box as you type.

  • 4
    Copy

    Use the copy button below either box to save the result to your clipboard.

Frequently Asked Questions

ROT13 (Rotate by 13) is a simple substitution cipher that replaces a letter with the 13th letter after it in the alphabet. Because the Latin alphabet has 26 letters, applying ROT13 twice returns the original text.
No, absolutely not. ROT13 provides no real security and can be easily decoded by anyone. It is primarily used for obscuring spoilers, punchlines to jokes, or puzzle solutions, not for protecting sensitive data.
Simply enter the encoded text into the input box. Since ROT13 is its own inverse, the same process used to encode it will also decode it.
It stands for 'ROTate by 13 places'. It is a specific case of the Caesar cipher where the shift amounts to exactly half the alphabet.
No, ROT13 only rotates letters (A-Z, a-z). Numbers, punctuation, and other symbols remain unchanged.
No, ROT13 is fixed at a 13-character shift. If you want to use a different shift amount (like 3 or 7), please use our Caesar Cipher tool instead.