Encode and decode ROT13 text instantly. Each letter is shifted 13 places through the alphabet — and encoding twice restores the original. Handy for puzzles, spoilers and playful obfuscation (not real security).
ROT13 is symmetric: run the output through again to decode it.
How to Use
- Type or paste text into the input box — it encodes as you type.
- Read or copy the ROT13 output.
- To decode, paste ROT13 text back into the input.
- Remember: encoding twice returns the original text.
Key Features
- Live encoding — output updates with every keystroke.
- Symmetric cipher — the same operation encodes and decodes.
- Preserves everything else — case kept; numbers and punctuation untouched.
- One-click copy — send the result to your clipboard.
- 100% private — runs entirely in your browser; nothing is sent or stored.
FAQs
Is ROT13 real encryption?
No. It is trivial letter substitution — fine for puzzles and spoilers, but offers no real security. Never use it for sensitive data.
How do I decode ROT13 text?
Paste it into the input box. Because the alphabet shift is 13 — exactly half of 26 — applying ROT13 twice returns the original text.
Does it change numbers or punctuation?
No. Only the letters A–Z and a–z are shifted; everything else passes through unchanged.
Is my text sent anywhere?
No. The encoding runs entirely in your browser and never transmits or saves your text.
Related Tools
Try these related tools: Base64 Encoder, Text to Binary Converter and Morse Code Translator.