ROT13 encoding
text = HELLO
Result: URYYB
ROT13 Demo
EDUCATIONAL DEMONSTRATION ONLY — ROT13 shifts each letter by 13 positions. It is its own inverse: applying ROT13 twice returns the original text. Historically used for spoiler protection and simple obfuscation in online forums.
Privacy: this tool processes your data entirely in your browser. Nothing you paste or type is sent to the server.
Enter your values and press Calculate — the result appears here.
Worked examples
Frequently asked questions
Why is ROT13 its own inverse?
The alphabet has 26 letters. Shifting by 13 twice (13+13=26) brings you back to the original position.
Is ROT13 secure?
No. It provides zero security — it is a single fixed substitution with only one possible "key". It was never intended for security, only for spoiler protection and casual obfuscation.
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