About this tool
Convert international domain names such as münchen.de or مثال.إختبار to their xn-- form and back — also inside email addresses and URLs.
Each label that contains non-ASCII letters is normalised (NFC, lower case) and encoded with the Punycode algorithm of RFC 3492, then prefixed with xn--; decoding reverses it label by label.
Example: münchen.de → xn--mnchen-3ya.de
Look-alike letters from other scripts can imitate a known brand (homograph attack). The xn-- form shows what the address really is.
Quick steps
- Paste your text or open a file (or press Try an example).
- Choose the options — the result updates as you type.
- Copy the result or download it as a file.
Everything runs in your browser. Nothing you type is sent to 1CLIK.
FAQ
How does the Punycode / IDN Converter work?
Each label that contains non-ASCII letters is normalised (NFC, lower case) and encoded with the Punycode algorithm of RFC 3492, then prefixed with xn--; decoding reverses it label by label.
What should I keep in mind?
Look-alike letters from other scripts can imitate a known brand (homograph attack). The xn-- form shows what the address really is.
Is my text uploaded or saved?
No. It is processed on your device in a separate background task that is stopped if it takes too long; nothing is stored or sent.