ROT13 Encoder / Decoder
Encode or decode text with ROT13 cipher instantly online. ROT13 is self-inverse — applying it twice returns the original text. Free ROT13 tool, runs entirely in your browser.
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How ROT13 Works
- Type or paste your text in the left panel.
- The ROT13-encoded output appears instantly on the right.
- To decode, paste the encoded text back into the left panel — ROT13 is its own inverse.
- Click Load Example to encode a sample sentence.
How It Works
- Each letter is shifted 13 positions forward in the alphabet
- A → N, B → O, ... Z → M (wraps around)
- Numbers, spaces, and punctuation are unchanged
- Applying ROT13 twice returns the original text