ROT13 Encoder Text
Apply the classic ROT13 letter rotation — run it twice to undo it.
ROT13 Encoder is a free online tool that apply the classic ROT13 letter rotation — run it twice to undo it. It runs entirely in your web browser using plain JavaScript, so files are processed on your own device and never uploaded to a server. There is no sign-up, no file size limit imposed by the site, no watermark and no paid tier.
- Price
- Free — no account, no quota, no watermark
- Category
- Text
- Where it runs
- In your browser, on your device
- Files uploaded
- None
- Technology
- plain JavaScript
- Settings
- None — it just works
- Works offline
- Yes, after the first visit
About ROT13 Encoder
ROT13 is a Caesar cipher with a shift of 13. Because the Latin alphabet has 26 letters, applying it twice returns the original text — encoding and decoding are the same operation. It was never intended as security. Its actual purpose, on Usenet and still on some forums, is to hide spoilers and punchlines from casual reading while remaining trivially recoverable.
How to use it
- Paste the text you want to run through rot13 encoder.
- There is nothing to configure — the result updates as you type.
Under the hood
| Runs on | plain JavaScript — runs the whole thing |
Questions
Is ROT13 encryption?
No. There is no key, and the algorithm is public and fixed. It obscures text from an accidental glance and nothing more.
What is ROT47?
The same idea over the 94 printable ASCII characters rather than 26 letters, so it scrambles digits and punctuation too. Also self-inverse, and also not security.