How to Use the ROT13 Text Converter
ROT13 is the simplest form of the Caesar cipher, shifting every letter 13 places through the alphabet — A becomes N, H becomes U, and so on. Because 13 is exactly half of 26, applying the same shift a second time returns the original text, so encoding and decoding are the same operation. This tool converts whatever you type instantly, leaving numbers, symbols, and spaces untouched. There's no need to pick a direction — just paste the text and read the result.
Useful for
- Hiding spoilers or answers in forum posts
- Adding a simple cipher element to puzzles or escape rooms
- Learning how character-code substitution ciphers work
- Decoding text that was already ROT13-encoded
Frequently Asked Questions
Each letter is shifted 13 places through the alphabet — A becomes N, B becomes O, and so on. Since 13 is half of 26, applying the same shift again returns the original letter.
Yes. Paste the encoded text back in and it converts to the original, since encoding and decoding use the exact same operation.
No, only English letters (A-Z, a-z) are shifted; numbers, punctuation, and other characters stay exactly as typed.