ROT13 Cipher

ROT13 is a simple letter substitution cipher that replaces each letter with the letter 13 positions after it in the alphabet. Applying ROT13 twice returns the original text.

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What is ROT13?

ROT13 (rotate by 13 places) is a simple letter substitution cipher. It replaces each letter with the 13th letter after it in the alphabet. Since there are 26 letters, applying ROT13 twice gives you the original text.

How It Works

  • A becomes N, B becomes O, C becomes P...
  • N becomes A, O becomes B, P becomes C...
  • Numbers and symbols are unchanged

Examples

  • HELLO becomes URYYB
  • SECRET becomes FRPERG

Note

ROT13 is not encryption - it provides no real security. It's used primarily to hide spoilers, puzzle answers, or offensive content from casual viewing.

Keyboard Shortcuts

  • Ctrl + L - Focus input field
  • Alt + S - Swap input/output
  • Ctrl + Shift + C - Copy result
  • Ctrl + S - Download result
  • Escape - Clear all inputs
  • Tab - Insert spaces
  • Double-click output area - Select all text