All tools · Text tools

ROT13 / ROT47

Classic letter-rotation obfuscation (ROT13 and ROT47).

Free to use, no sign-up required. ROT13 / ROT47 is one of 198 tools built into Xenition, alongside a chat that can use them for you.

Encodes or decodes text with ROT13 and ROT47, the letter-rotation ciphers used to hide spoilers, puzzle answers and punchlines in plain sight. Both results are shown at once.

How to use ROT13 / ROT47

  1. Type or paste text into the box.
  2. Read the ROT13 output and the ROT47 output below it.
  3. To decode, paste the encoded text in again. Both ciphers undo themselves.

How it works

ROT13 shifts each English letter 13 places, wrapping from Z back to A, and keeps its case. Digits, punctuation and other characters are untouched. ROT47 shifts every printable ASCII character from ! (33) to ~ (126) by 47 places within that 94-character range, so digits and punctuation change too. Spaces and characters outside that range stay the same.

Example

“Hello, World! 123” becomes “Uryyb, Jbeyq! 123” in ROT13 and “w6==@[ (@C=5P `ab” in ROT47.

Questions about ROT13 / ROT47

Why does running ROT13 twice give back the original?

The alphabet has 26 letters, so two shifts of 13 add up to a full circle. ROT47 works the same way, as 47 is half of its 94-character range.

Is ROT13 safe for hiding passwords?

No. It has no key and anyone can reverse it, which is why it is used for spoilers, not secrets.

Use it from chat

You do not have to open ROT13 / ROT47 to use it. Ask Xenition in plain language and it runs the right tool, then carries the answer into whatever you are working on — a document, a spreadsheet, a deck.

Related tools