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ROT13 Encoder & Decoder

Encode and decode ROT13 text.

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ℹī¸ About ROT13

ROT13 (Rotate by 13 places) is a simple letter substitution cipher:

  • Each letter is replaced by the letter 13 positions after it in the alphabet
  • A ↔ N, B ↔ O, C ↔ P, ..., M ↔ Z
  • Non-alphabetic characters (numbers, punctuation, spaces) remain unchanged
  • Applying ROT13 twice returns the original text (13 × 2 = 26)
  • Often used to hide spoilers, punchlines, or email addresses

How to use ROT13 Encoder/Decoder

  1. 1
    Enter your text — Type or paste the text you want to encode or decode using ROT13.
  2. 2
    Click "Apply ROT13" — The cipher will be applied instantly to your text.
  3. 3
    Copy or Download — Use the Copy button to paste elsewhere, or Download to save as a text file.
  4. 4
    Swap if needed — Use the Swap button to move the result back to input for another ROT13 operation.

The ROT13 Encoder/Decoder runs entirely in your browser — your data never leaves your machine. ROT13 is a reversible cipher.