Want to hide a spoiler, a puzzle answer, or a joke so readers only see it when they choose to? This free rot13 encoder rotates every letter 13 places through the alphabet — A becomes N, N becomes A, and “Hello” becomes “Uryyb”. Because 13 is exactly half of 26, running text through it twice returns the original, so the same tool both encodes and decodes. Everything runs in your browser, so nothing is uploaded, nothing is stored, and no signup is needed. Be clear about the limit: ROT13 is not encryption and hides nothing from anyone who tries.
How to use this rot13 encoder
Three quick steps — no signup, no cost.
Type or paste the spoiler, answer, or message you want to obscure.
Every letter shifts 13 places, wrapping around at the end of the alphabet; case is preserved and digits, punctuation, and spacing pass through unchanged.
Copy the encoded text — and paste it back through the same tool any time to decode it.
Why this rot13 encoder is a courtesy, not a lock
ROT13 was never trying to be encryption — it is a way of asking readers to choose to read something.
Apply it twice and you are back where you started, so there is no separate decode mode to get wrong.
Uppercase stays uppercase, lowercase stays lowercase, and digits, punctuation, and emoji pass through exactly as they were.
There is nothing to share, lose, or guess — which is also why it keeps nothing secret.
The rotation runs in your browser, so your text is never uploaded or stored.
ROT13 Encoder FAQs
Short, direct answers to the questions readers ask most.
No. ROT13 has no key and anyone can reverse it in a second, so it is a readability convention for hiding spoilers and puzzle answers — never a way to keep information secret.
Paste the encoded text in and run it again: because 13 is half of 26, a second rotation of 13 lands every letter back where it started.
No. Plain ROT13 rotates only the letters A–Z and a–z; digits, punctuation, spacing, and non-English characters pass through unchanged.
It was widely used on Usenet in the 1980s to obscure spoilers, jokes, and sensitive content so readers had to actively choose to reveal it.
Yes — free, with no account and no signup.
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