ROT13 Encoder and Decoder
ROT13 is a simple letter substitution that rotates each letter thirteen places through the alphabet, so A becomes N, B becomes O, and so on. Because the alphabet has twenty six letters, applying ROT13 twice returns the original text, which means the same button both scrambles and unscrambles. It is not real encryption and offers no security, but it has a long history online as a lightweight way to hide spoilers, punchlines, and puzzle answers so a reader has to opt in before seeing them. Numbers, spaces and punctuation pass through unchanged, and letter case is preserved. Type or paste your text and the transformed version appears instantly. Everything runs in your browser, so nothing is transmitted or logged anywhere.
How to use ROT13 Encoder and Decoder
- Paste the text you want to encode or decode.
- Apply ROT13.
- Read the shifted result.
- Copy it.
Frequently asked questions
How does ROT13 work?
ROT13 shifts each letter 13 places in the alphabet, so A becomes N and N becomes A, wrapping around at the end.
Why is one button enough for both directions?
Because 13 is half of 26, applying ROT13 twice returns the original text, so the same operation both encodes and decodes.
Is ROT13 secure?
No. ROT13 is a simple obfuscation used to hide spoilers or answers, not real encryption, since anyone can reverse it instantly.
What is ROT13 Encoder and Decoder?
ROT13 is a simple letter substitution that rotates each letter thirteen places through the alphabet, so A becomes N, B becomes O, and so on. Because the alphabet has twenty six letters, applying ROT13 twice returns the original text, which means the same button both scrambles and unscrambles.
Is ROT13 Encoder and Decoder free to use?
Yes. ROT13 Encoder and Decoder is completely free, with no sign-up and no usage limits.
Does ROT13 Encoder and Decoder work in a web browser?
Yes. ROT13 Encoder and Decoder runs in any modern web browser. There is nothing to download or install.
Is my data private with ROT13 Encoder and Decoder?
Yes. ROT13 Encoder and Decoder runs entirely on your device in your browser, so nothing you enter is uploaded to a server.
Badge
Link this tool from a README, doc or site. The badge links back to this page.
[](https://yourhack.ai/rot13-encoder)