ROT13 Encoder / Decoder
Shift every letter 13 places in the alphabet. ROT13 is its own inverse, so run it twice to decode. Free, no signup.
Scan to open on your phone
Point your phone camera at the code to open this tool.
Shift every letter 13 places in the alphabet. ROT13 is its own inverse, so run it twice to decode. Free, no signup.
How to use ROT13 Encoder / Decoder
- Paste or type your contentThe result appears as you type — there is no submit button.
- Read and copy the resultThe output updates live and the copy button takes it in one click.
Worked example
- Hello World
- Uryyb Jbeyq
Nothing you enter leaves your device
All of the work happens inside your browser. Whatever you type is never packaged up and sent to a server, and no request this page makes carries it.
That makes it safe for contract amounts, personal details and internal documents you would rather not hand to a third party — close the tab and it is gone.
What this tool does not do
ROT13 Encoder / Decoder only does what a browser can do on its own — it talks to no backend service. So it keeps no history for you and syncs nothing across devices; if you need a record, copy or download the result.
It is also not a substitute for professional judgement. For legal, medical or tax decisions, treat the output as a starting point rather than a final answer.
Frequently Asked Questions
- What is ROT13 used for?
- It is a classic way to hide spoilers or puzzle text. Because the alphabet has 26 letters, applying it twice returns the original.
- Does it change numbers and punctuation?
- No. Only letters move; digits and symbols stay exactly where they are.